v2.5.1

51c347b Not support darwin
ddf0c3c linux login: Reimplemented with pure Go
11203ce build.sh: add ldflags="-s -w"
1edd3cc Delayed check user
91ecac9 Drop version match

Precompiled:
rttys-linux-386.tar.gz
rttys-linux-amd64.tar.gz
rttys-windows-386.zip
rttys-windows-amd64.zip