elm-format tests fail on Windows

[jayvdb]

______________________ ElmLintBearTest.test_bad_function ______________________
self = <tests.elm.ElmLintBearTest.ElmLintBearTest testMethod=test_bad_function>
    def test_bad_function(self):
        prepared = prepare_file(bad_file_function.splitlines(),
                                filename=None, create_tempfile=True)
    
        with prepared as (file, fname):
            self.check_results(
                self.uut,
                bad_file_function.splitlines(),
                [Result.from_values('ElmLintBear',
                                    message=result_message_bad_function,
                                    file=fname,
                                    line=6,
                                    severity=RESULT_SEVERITY.NORMAL)],
                filename=fname,
>               create_tempfile=False)
tests\elm\ElmLintBearTest.py:135: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox\py34-noskip-pip-npm-gem-go-perl-php-java8-adhoc-win-check-codecov\lib\site-packages\coalib\testing\LocalBearTestHelper.py:285: in check_results
    sorted(bear_output), sorted(results))
.tox\py34-noskip-pip-npm-gem-go-perl-php-java8-adhoc-win-check-codecov\lib\site-packages\coalib\testing\LocalBearTestHelper.py:138: in assertComparableObjectsEqual
    self.assertEqual(observed_result, expected_result)
E   AssertionError: Lists differ: [] != [<Result object(id=0xad4fdabc99ba422d83f08[728 chars]e70>]
E   
E   Second list contains 1 additional elements.
E   First extra element 0:
E   <Result object(id=0xad4fdabc99ba422d83f0858b9493b7a2, origin='ElmLintBear', affected_code=(<SourceRange object(start=<SourcePosition object(file='C:\\Users\\appveyor\\AppData\\Local\\Temp\\tmplcowwzch', line=6, column=None) at 0x836f170>, end=<SourcePosition object(file='C:\\Users\\appveyor\\AppData\\Local\\Temp\\tmplcowwzch', line=6, column=None) at 0x836f6f0>) at 0x836faf0>,), severity=NORMAL, confidence=100, message='text (toString [four)\x1b[31m\n                         ^\x1b[0m\nI am looking for one of the following things:\n\n    ","\n    "]"\n    a field access like .name\n    an expression\n    an infix operator like +\n    an infix operator like `andThen`\n    more letters in this name\n    whitespace', aspect=NoneType, applied_actions={}) at 0x836fe70>
E   
E   Diff is 783 characters long. Set self.maxDiff to None to see it

https://ci.appveyor.com/project/jayvdb/coala-bears/builds/25185330/job/ab5vyu8usei0qpg2