Update Travis script [skip ci]
Update Travis script [skip ci]

- Update to use my API key
- Don't try to auto-publish pre-releases

MithrilJS/mithril.js,lhorie/mithril.js,barneycarroll/mithril.js,impinball/mithril.js,pygy/mithril.js,barneycarroll/mithril.js,pygy/mithril.js,MithrilJS/mithril.js,impinball/mithril.js,lhorie/mithril.js