chore: travis-ci config and gradle 3.4.1

.travis.yml

@@ -0,0 +1,4 @@
+language: java
+
+jdk:
+  - oraclejdk8

build.gradle

@@ -1,11 +1,11 @@
 buildscript {
-    repositories {
-        jcenter()
-    }
-    dependencies {
-        classpath 'io.ratpack:ratpack-gradle:1.0.0',
-                  'com.github.jengelman.gradle.plugins:shadow:1.2.1'
-    }
+
+  repositories {
+    jcenter()
+  }
+  dependencies {
+    classpath 'io.ratpack:ratpack-gradle:1.0.0'
+  }
 }
 
 if (!JavaVersion.current().java8Compatible) {
@@ -15,7 +15,7 @@ if (!JavaVersion.current().java8Compatible) {
 // The “ratpack” plugin applies the “application” plugin, making it easy to create a standalone application.
 // See: http://gradle.org/docs/current/userguide/application_plugin.html
 apply plugin: "io.ratpack.ratpack-java"
-apply plugin: "com.github.johnrengelman.shadow"
+apply plugin: "idea"
 
 repositories {
     jcenter()

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Sat Nov 09 15:05:56 GMT 2013
+#Wed Mar 15 21:21:35 CET 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.4.1-bin.zip