Gather assert types conditional on installed PHPStan version (#301)

* Gather assert types conditional on installed PHPStan version

* Update DynamicReturnTypeExtensionTest.php

Update examples (#279)

Do not process unknown hooked functions (#272)

Update README.md (#267)

Update README.md (#267)

Include ApplyFiltersTestClass in tests

Fix heading levels in readme (#256)

fix TravisCI badge

Add WP_CONTENT_DIR constant (#216)

Add final newline to get_approved_comments.php