Add gitter webhook setting to travis.yml.
Add gitter webhook setting to travis.yml.

st0012/Rooby,hachi8833/goby,hachi8833/goby,goby-lang/goby,Maxwell-Alexius/goby,goby-lang/goby,Maxwell-Alexius/goby,st0012/Rooby,Maxwell-Alexius/goby,hachi8833/goby,goby-lang/goby