Cache git submodules in travis
Cache git submodules in travis

iliabylich/opal,gabrielrios/opal,gausie/opal,c42engineering/opal,jgaskins/opal,jgaskins/opal,jgaskins/opal,Flikofbluelight747/opal,suyesh/opal,c42engineering/opal,fazibear/opal,suyesh/opal,bbatsov/opal,Flikofbluelight747/opal,gausie/opal,Mogztter/opal,jannishuebl/opal,fazibear/opal,kachick/opal,iliabylich/opal,kachick/opal,fazibear/opal,wied03/opal,gausie/opal,merongivian/opal,Mogztter/opal,Ajedi32/opal,jannishuebl/opal,iliabylich/opal,merongivian/opal,jannishuebl/opal,opal/opal,gabrielrios/opal,opal/opal,Ajedi32/opal,merongivian/opal,opal/opal,opal/opal,wied03/opal,suyesh/opal,c42engineering/opal,kachick/opal,bbatsov/opal,bbatsov/opal,Ajedi32/opal,Mogztter/opal,Mogztter/opal,kachick/opal,wied03/opal,Flikofbluelight747/opal,gabrielrios/opal