Remove $GOPATH check from travis.sh
Remove $GOPATH check from travis.sh

Travis always sets $GOPATH to /home/travis/gopath, so we don't need
this.

rminnich/u-root,hugelgupf/u-root,rminnich/u-root,hugelgupf/u-root,rminnich/u-root,u-root/u-root,u-root/u-root,rminnich/u-root,GanShun/u-root,hugelgupf/u-root,GanShun/u-root,GanShun/u-root,u-root/u-root,hugelgupf/u-root