Before:
  runtime ale_linters/elixir/mix.vim

After:
  call ale#linter#Reset()

Execute(The mix handler should parse lines correctly):

  AssertEqual
  \ [
  \   {
  \     'bufnr': 347,
  \     'lnum': 87,
  \     'col': 0,
  \     'text': 'undefined function update_in/4',
  \     'type': 'E',
  \   },
  \ ],
  \ ale_linters#elixir#mix#Handle(347, [
  \   '** (CompileError) apps/sim/lib/sim/server.ex:87: undefined function update_in/4'
  \ ])