Update CHANGELOG.md

Author: dunglas

CHANGELOG.md

@@ -5,6 +5,8 @@ CHANGELOG
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 * Allow to override the `APP_ENV` environment variable passed to the web server by setting `PANTHER_APP_ENV`
+* Fix using assertions with a client created through `PantherTestCase::createClient()`
+* Don't call `PantherTestCase::getClient()` if this method isn't `static`
 
 0.5.0
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