Update github.md with tag to be added

Signed-off-by: Pascal Brand <pascal.brand@st.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Merge branch 'master' of https://github.com/OP-TEE/optee_os
Merge branch 'master' of https://github.com/z08053520/optee_os
fix checkpatch.pl error

Signed-off-by: "Rock P. Zhang" <RockPZhang@viatech.com.cn>