priha 0.1.0

If you are a guy who always find something wrong only after sending a pull requset, Priha will help you because Priha lets you examine files' diff between the parent branch and HEAD of the current branch in a real GitHub pull request. However, DO NOT use Priha for your secret repostitory. Since Priha pushes some commits to another repository on GitHub, it easily cause a security incident, espacially the branch you set for Priha is "public". Also, Priha removes all branches on the repository specified in config, so you MUST create a new repository for this purpose and DO NOT use the existing one.