appveyor: fix syntax error
appveyor: fix syntax error

zzuegg/jmonkeyengine,zzuegg/jmonkeyengine,zzuegg/jmonkeyengine,jMonkeyEngine/jmonkeyengine,atomixnmc/jmonkeyengine,jMonkeyEngine/jmonkeyengine,zzuegg/jmonkeyengine,atomixnmc/jmonkeyengine,atomixnmc/jmonkeyengine,atomixnmc/jmonkeyengine,GreenCubes/jmonkeyengine,GreenCubes/jmonkeyengine,jMonkeyEngine/jmonkeyengine,atomixnmc/jmonkeyengine,GreenCubes/jmonkeyengine,atomixnmc/jmonkeyengine,jMonkeyEngine/jmonkeyengine,GreenCubes/jmonkeyengine