v0.2.1

Fixed

• Fix incorrect 404 response by customizing the gin.Engine.NoRoute when the gzip compression enabled.
• Fix sync a deleted file already will create an empty file to target path.
• Fix hit rate is low that cancel the write message when receiving a remove event.

Enhancements

• Remove the server_tmpl and server_tmpl_override flags, read templates from memory now.
• Keep the web logs alone.
• Add auth api version to support backward compatibility in the future.
• Add auth request info expire time, if over expire time then auth failed.
• Update README.md.