[EventLoop] Remove pecl-event from .travis.yml.
[EventLoop] Remove pecl-event from .travis.yml.

This is not needed right now as it should be part of a different PR
introducing the new ExtEventLoop class.

krageon/react,naroga/react,dagopoot/react,nemurici/react,sachintaware/react,ympons/react,ericariyanto/react,dagopoot/react,cystbear/react,cystbear/react,naroga/react,nemurici/react,sachintaware/react,krageon/react,ericariyanto/react,reactphp/react,cesarmarinhorj/react,ympons/react,cesarmarinhorj/react