diff --git a/package-lock.json b/package-lock.json
index 1e790f2..c3be37c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -531,25 +531,21 @@
         "abbrev": {
           "version": "1.1.1",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "aproba": {
           "version": "1.2.0",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "are-we-there-yet": {
           "version": "1.1.4",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "delegates": "^1.0.0",
@@ -559,13 +555,11 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
@@ -575,37 +569,31 @@
         "chownr": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "debug": {
           "version": "2.6.9",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "ms": "2.0.0"
@@ -614,25 +602,27 @@
         "deep-extend": {
           "version": "0.5.1",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "delegates": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "detect-libc": {
           "version": "1.0.3",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
+        "eslint-visitor-keys": {
+          "version": "1.3.0",
+          "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.3.0.tgz",
+          "integrity": "sha512-6J72N8UNa462wa/KFODt/PJ3IU60SDpC3QXC1Hjc1BXXpfL2C9R5+AU7jhe0F6GREqVMh4Juu+NY7xn+6dipUQ==",
+          "dev": true
+        },
         "fs-minipass": {
           "version": "1.2.5",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "minipass": "^2.2.1"
@@ -641,13 +631,11 @@
         "fs.realpath": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "gauge": {
           "version": "2.7.4",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "aproba": "^1.0.3",
@@ -663,7 +651,6 @@
         "glob": {
           "version": "7.1.2",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "fs.realpath": "^1.0.0",
@@ -677,13 +664,11 @@
         "has-unicode": {
           "version": "2.0.1",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "iconv-lite": {
           "version": "0.4.21",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "safer-buffer": "^2.1.0"
@@ -692,7 +677,6 @@
         "ignore-walk": {
           "version": "3.0.1",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "minimatch": "^3.0.4"
@@ -701,7 +685,6 @@
         "inflight": {
           "version": "1.0.6",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "once": "^1.3.0",
@@ -711,19 +694,16 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "ini": {
           "version": "1.3.5",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
@@ -732,13 +712,11 @@
         "isarray": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
@@ -747,13 +725,11 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
@@ -763,7 +739,6 @@
         "minizlib": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "minipass": "^2.2.1"
@@ -772,7 +747,6 @@
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "minimist": "0.0.8"
@@ -781,13 +755,11 @@
         "ms": {
           "version": "2.0.0",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "needle": {
           "version": "2.2.0",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "debug": "^2.1.2",
@@ -798,8 +770,6 @@
         "node-pre-gyp": {
           "version": "0.10.0",
           "bundled": true,
-          "dev": true,
-          "optional": true,
           "requires": {
             "detect-libc": "^1.0.2",
             "mkdirp": "^0.5.1",
@@ -816,7 +786,6 @@
         "nopt": {
           "version": "4.0.1",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "abbrev": "1",
@@ -826,13 +795,11 @@
         "npm-bundled": {
           "version": "1.0.3",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "npm-packlist": {
           "version": "1.1.10",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "ignore-walk": "^3.0.1",
@@ -842,7 +809,6 @@
         "npmlog": {
           "version": "4.1.2",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "are-we-there-yet": "~1.1.2",
@@ -854,19 +820,16 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "once": {
           "version": "1.4.0",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "wrappy": "1"
@@ -875,19 +838,16 @@
         "os-homedir": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "os-tmpdir": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "osenv": {
           "version": "0.1.5",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "os-homedir": "^1.0.0",
@@ -897,19 +857,16 @@
         "path-is-absolute": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "process-nextick-args": {
           "version": "2.0.0",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "rc": {
           "version": "1.2.7",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "deep-extend": "^0.5.1",
@@ -921,7 +878,6 @@
             "minimist": {
               "version": "1.2.0",
               "bundled": true,
-              "dev": true,
               "optional": true
             }
           }
@@ -929,7 +885,6 @@
         "readable-stream": {
           "version": "2.3.6",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "core-util-is": "~1.0.0",
@@ -944,7 +899,6 @@
         "rimraf": {
           "version": "2.6.2",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "glob": "^7.0.5"
@@ -953,43 +907,36 @@
         "safe-buffer": {
           "version": "5.1.1",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "sax": {
           "version": "1.2.4",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "semver": {
           "version": "5.5.0",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "set-blocking": {
           "version": "2.0.0",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "signal-exit": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
@@ -1000,7 +947,6 @@
         "string_decoder": {
           "version": "1.1.1",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "safe-buffer": "~5.1.0"
@@ -1009,7 +955,6 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
@@ -1018,13 +963,11 @@
         "strip-json-comments": {
           "version": "2.0.1",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "tar": {
           "version": "4.4.1",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "chownr": "^1.0.1",
@@ -1039,13 +982,11 @@
         "util-deprecate": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "wide-align": {
           "version": "1.1.2",
           "bundled": true,
-          "dev": true,
           "optional": true,
           "requires": {
             "string-width": "^1.0.2"
@@ -1054,13 +995,11 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true,
           "optional": true
         },
         "yallist": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true,
           "optional": true
         }
       }
@@ -1806,9 +1745,9 @@
       }
     },
     "pathval": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.0.tgz",
-      "integrity": "sha1-uULm1L3mUwBe9rcTYd74cn0GReA=",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.1.tgz",
+      "integrity": "sha512-Dp6zGqpTdETdR63lehJYPeIOqpiNBNtc7BpWSLrOje7UaIsE5aY92r/AunQA7rsXvet3lrJ3JnZX29UPTKXyKQ==",
       "dev": true
     },
     "pify": {