v3.1.2

fix typo based on v3.1.0

github release assets (recommend!)	Sourceforge	baiduyun	Pypi.org
Assets below ↓↓↓↓↓↓↓↓↓ 点击下方 Assets		百度网盘 提取码: 7ip6

Linux can install by pip3 install comtool, if you are Chinese, use pip3 install comtool -i https://pypi.douban.com/simple, and launch by command comtool