docs: how to release a new version at pypi

Author: weakish

README.md

@@ -25,6 +25,19 @@ cd docs
 make html
 ```
 
+## Release a New Version
+
+1. Edit `changelog` and `setup.py` (`version`).
+2. Commit them and add a new tag. Then publish a new release at GitHub.
+3. Publish the package at at PyPI with following commands:
+
+```sh
+python3 -m pip install --user --upgrade setuptools wheel
+rm -rf dist
+python3 setup.py sdist bdist_wheel
+python3 -m pip install --user --upgrade twine
+twine upload dist/*
+```
 
 ## License
 

setup.cfg

@@ -0,0 +1,2 @@
+[bdist_wheel]
+universal = 1