Merge branch 'v2.0' of https://github.com/wingjay/jianshi

Merge branch 'v2.0' of github.com:wingjay/jianshi into v2.0

support user customize background color and bug fix

upgrade to 1.2.1

upgrade to 1.2.0

Merge branch 'master' of github.com:wingjay/jianshi

Update README.md