travis: use cache rules from docs
travis: use cache rules from docs

phr00t/jmonkeyengine,zzuegg/jmonkeyengine,GreenCubes/jmonkeyengine,jMonkeyEngine/jmonkeyengine,atomixnmc/jmonkeyengine,GreenCubes/jmonkeyengine,GreenCubes/jmonkeyengine,atomixnmc/jmonkeyengine,zzuegg/jmonkeyengine,zzuegg/jmonkeyengine,phr00t/jmonkeyengine,bsmr-java/jmonkeyengine,phr00t/jmonkeyengine,GreenCubes/jmonkeyengine,jMonkeyEngine/jmonkeyengine,atomixnmc/jmonkeyengine,zzuegg/jmonkeyengine,atomixnmc/jmonkeyengine,bsmr-java/jmonkeyengine,bsmr-java/jmonkeyengine,atomixnmc/jmonkeyengine,jMonkeyEngine/jmonkeyengine,atomixnmc/jmonkeyengine,bsmr-java/jmonkeyengine,phr00t/jmonkeyengine,jMonkeyEngine/jmonkeyengine