docs: update features

Author: sean2077

README.md

@@ -11,6 +11,7 @@ A python CLI framework base on [argparse](https://docs.python.org/3/library/argp
 - [x] support easy-to-use interface for building complex CLI program
 - [x] support rich-text and flexible log system (base on [rich](https://github.com/willmcgugan/rich))
 - [x] support command auto-completion (base on [argcomplete](https://github.com/kislyuk/argcomplete))
+- [ ] support auto generating and updating usage (based on [auto-usage](https://github.com/zhangxianbing/auto-usage))
 
 ## Quick Start