Update README based on newest release

Update go-gin and go-grpc package source

Update assets of pkg command

Merge pull request #2 from dongxuny/master

Add pkg sub command for creating rk package

Run fmt only in github action now

Update validation logic for install command

Bump up to stable version for rk libraries

Bump up rk version to v1.0.3

Make rk cmd gettable directly

Refactoring rk command