release 4.2.16 (update changelog.md)

release 4.2.15

Remove unnecessary Safari hack (mediaelement#2731)

release 4.2.14

Emergency Bugfix 4.2.13 (mediaelement#2697)

* Undo changes introduced 4.2.11 to fix unmute bug

*  added missing target build/renderers/youtube.js in Gruntfile.js

* add build/* for 4.2.13 release

release 4.2.12

Update to 4.2.11

Fix append method is not support on old browser (mediaelement#2580)

Fix mixed spaces and tab (PR#2550)

release 4.2.10