Update .travis.yml
Update .travis.yml

upgrading ruby 2.1.2 to 2.1.5
CloCkWeRX/growstuff,yez/growstuff,Growstuff/growstuff,josefdaly/growstuff,Br3nda/growstuff,gustavor-souza/growstuff,josefdaly/growstuff,andrba/growstuff,Br3nda/growstuff,jdanielnd/growstuff,jdanielnd/growstuff,maco/growstuff,sksavant/growstuff,korabh/growstuff,josefdaly/growstuff,oshiho3/growstuff,Growstuff/growstuff,andrba/growstuff,cesy/growstuff,sksavant/growstuff,CjayBillones/growstuff,sksavant/growstuff,CloCkWeRX/growstuff,cesy/growstuff,borracciaBlu/growstuff,oshiho3/growstuff,josefdaly/growstuff,yez/growstuff,pozorvlak/growstuff,CloCkWeRX/growstuff,dv2/growstuff,korabh/growstuff,sksavant/growstuff,Br3nda/growstuff,Growstuff/growstuff,gustavor-souza/growstuff,maco/growstuff,andrba/growstuff,oshiho3/growstuff,CjayBillones/growstuff,cesy/growstuff,maco/growstuff,CarsonBills/GrowStuffCMB,borracciaBlu/growstuff,oshiho3/growstuff,dv2/growstuff,CjayBillones/growstuff,CloCkWeRX/growstuff,Br3nda/growstuff,dv2/growstuff,CarsonBills/GrowStuffCMB,CjayBillones/growstuff,GabrielSandoval/growstuff,jdanielnd/growstuff,yez/growstuff,gustavor-souza/growstuff,Growstuff/growstuff,CarsonBills/GrowStuffCMB,GabrielSandoval/growstuff,pozorvlak/growstuff,korabh/growstuff,andrba/growstuff,gustavor-souza/growstuff,borracciaBlu/growstuff,GabrielSandoval/growstuff,maco/growstuff,pozorvlak/growstuff,borracciaBlu/growstuff,yez/growstuff,cesy/growstuff,jdanielnd/growstuff,pozorvlak/growstuff,GabrielSandoval/growstuff,dv2/growstuff,korabh/growstuff,CarsonBills/GrowStuffCMB