Now the golang version 1.1 has been released by the official website[1], so let's add support for this version, else we'll get below build error when using golang 1.11: ``` build/makelib/golang.mk:103: *** unsupported go version. Please make install one of the following supported version: '1.7|1.8|1.9|1.10'. Stop. ``` [1] https://golang.org/dl/ Signed-off-by: Dennis Chen <dennis.chen@arm.com>