minor #3773 AbstractFixerWithAliasedOptionsTestCase - don't export (keradus)

This PR was merged into the 2.2 branch.

Discussion
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AbstractFixerWithAliasedOptionsTestCase - don't export

fixes https://travis-ci.org/FriendsOfPHP/PHP-CS-Fixer/jobs/381061961#L579

Commits
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23879073 AbstractFixerWithAliasedOptionsTestCase - don't export

.gitattributes

@@ -5,6 +5,7 @@ tests/Differ/AbstractDifferTestCase.php export-ignore
 tests/Fixtures/ export-ignore
 tests/Linter/AbstractLinterTestCase.php export-ignore
 tests/Report/AbstractReporterTestCase.php export-ignore
+tests/Test/AbstractFixerWithAliasedOptionsTestCase.php export-ignore
 tests/Test/AbstractTransformerTestCase.php export-ignore
 
 .appveyor.yml export-ignore