merging in material that will be folded in

SourceMaterial/engineering/releasing-python.md

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+---
+title: Releasing a New Version (Python Library)
+sidebar: Handbook
+showTitle: true
+---
+
+## How to Release
+1. Increase `VERSION` in `posthog/version.py`
+2. Update `CHANGELOG.md` with a short summary of the changes
+3. run `make release` and `make release_analytics`
+4. `git commit -am "Release X.Y.Z."` (where X.Y.Z is the new version)
+5. `git tag -a X.Y.Z -m "Version X.Y.Z"` (where X.Y.Z is the new version).