Minor appveyor config file tweaks.
Minor appveyor config file tweaks.

eelve/grunt,vladikoff/grunt,fscherwi/grunt,thejameskyle/grunt,paladox/grunt,lkiarest/grunt,Chhunlong/grunt,IveWong/grunt,FeodorFitsner/grunt,yonglehou/grunt,ThiagoGarciaAlves/grunt,q310550690/grunt,youmyyou/grunt,imjerrybao/grunt,felixgrey/grunt,paulcbetts/grunt,shama/grunt,r14r/fork_grunt_master,zackexplosion/grunt,JaKXz/grunt,yosiazwan/grunt,modulexcite/grunt,abraheem/grunt,pandeysoni/grunt,coldrye-collaboration/grunt,r14r-work/fork_grunt_master,yuhualingfeng/grunt,goodeggs/grunt,arosa81/grunt,thecc4re/gruntjs