refactor: invert travis check, early-out blows up
refactor: invert travis check, early-out blows up

Not running within a script, so `exit 0` stops all processing which is
**NOT HELPFUL**.

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