Before:
  runtime ale_linters/pyrex/cython.vim

After:
  call ale#linter#Reset()

Execute(The cython handler should handle warnings and errors):
  AssertEqual
  \ [
  \   {
  \     'lnum': 42,
  \     'col': 7,
  \     'text': 'some warning',
  \     'type': 'W',
  \   },
  \   {
  \     'lnum': 777,
  \     'col': 21,
  \     'text': 'some error',
  \     'type': 'E',
  \   },
  \ ],
  \ ale_linters#pyrex#cython#Handle(347, [
  \   'warning: file:42:7: some warning',
  \   'file:777:21: some error',
  \ ])
