Update Travis config to Go 1.6.2
Update Travis config to Go 1.6.2

abourget/hugo,anthonyfok/hugo,mitchchn/hugo,fedelibre/hugo,ffrizzo/hugo,bogem/hugo,anthonyfok/hugo,jygastaud/hugo,mdhender/hugo,melo/hugo,bogem/hugo,fedelibre/hugo,abourget/hugo,tubo028/hugo,MarkDBlackwell/hugo,fedelibre/hugo,ffrizzo/hugo,fedelibre/hugo,digitalcraftsman/hugo,digitalcraftsman/hugo,Zenithar/hugo,mdhender/hugo,gohugoio/hugo,mayah/hugo,tischda/hugo,anthonyfok/hugo,mdhender/hugo,mayah/hugo,tubo028/hugo,melo/hugo,Zenithar/hugo,tischda/hugo,gohugoio/hugo,jygastaud/hugo,MarkDBlackwell/hugo,mdhender/hugo,gohugoio/hugo,mitchchn/hugo