Linter fails with Sublime Linter 4 on umbrella projects

[samsondav]

I get this error:

SublimeLinter: #339 elixirlinter 20180314105306_add_new_total_paid_back_fields.exs ERROR:

 Linter crashed.

Traceback (most recent call last):
  File "lint.backend in /Users/sam/Library/Application Support/Sublime Text 3/Installed Packages/SublimeLinter.sublime-package", line 97, in execute_lint_task
  File "lint.linter in /Users/sam/Library/Application Support/Sublime Text 3/Installed Packages/SublimeLinter.sublime-package", line 794, in lint
  File "lint.linter in /Users/sam/Library/Application Support/Sublime Text 3/Installed Packages/SublimeLinter.sublime-package", line 500, in get_cmd
  File "/Users/sam/Library/Application Support/Sublime Text 3/Packages/ElixirSublime/elixir_sublime.py", line 330, in cmd
    for path in find_ebin_folders(find_mix_project(self.filename)):
  File "/Users/sam/Library/Application Support/Sublime Text 3/Packages/ElixirSublime/elixir_sublime.py", line 86, in find_ebin_folders
    for lib in os.listdir(lib_path):
FileNotFoundError: [Errno 2] No such file or directory: '/Users/sam/code/nested/local-stack/elixir-umbrella/apps/nest_db/_build/dev/lib'

It's looking for the _build directory in the child app, but it should be looking in the umbrella project root.