[EventLoop] Add libevent extension to travis.yml
[EventLoop] Add libevent extension to travis.yml

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