Document the process of creating a new version

docs/how-to/release-a-new-version.md

@@ -0,0 +1,22 @@
+# How to release a new mquery version
+
+I never remembe the exact steps, so let's document this once and for all.
+
+This should be automated someday.
+
+* [ ] Bump the version
+  * [ ] pick a new version, make sure you follow semver
+  * [ ] Update `setup.py`
+  * [ ] Update `src/utils.py`
+  * [ ] `git checkout -b release/v1.6.0; git push origin release/v1.6.0`
+  * [ ] Create a PR and merge it
+* [ ] Push a new git tag
+  * [ ] `git tag v1.6.0`
+  * [ ] `git push origin v1.6.0`
+* [ ] Publish a release on github
+* [ ] Build the package
+    * [ ] `python3 setup.py build`
+    * [ ] `python3 setup.py sdist`
+    * [ ] Test the package
+* [ ] Publish the pypi package
+  * [ ] `twine upload dist/mquery-1.6.0.tar.gz`