Placekey

What's Changed
* Remove python 3.6 by felixsafegraph in https://github.com/Placekey/placekey-py/pull/22
* add python release to workflow by felixsafegraph in https://github.com/Placekey/placekey-py/pull/23
* Not sure why, but this makes it work with pyinstaller by Daniel-Vetter-Coverwhale in https://github.com/Placekey/placekey-py/pull/21
* Removed Optimistic Retry by jarredSafegraph in https://github.com/Placekey/placekey-py/pull/27
* Updated for v2 by jarredSafegraph in https://github.com/Placekey/placekey-py/pull/28

New Contributors
* Daniel-Vetter-Coverwhale made their first contribution in https://github.com/Placekey/placekey-py/pull/21
* jarredSafegraph made their first contribution in https://github.com/Placekey/placekey-py/pull/27

**Full Changelog**: https://github.com/Placekey/placekey-py/compare/v0.0.12...v0.0.13

* Add user-agent to request headers

* Move to a single source for version number

* Redirect requirements.txt to default to using dependencies in setup.py

* Update docs