Zappa

* Update documentation to reflect python 3.9 support (1137)

* Increase Lambda client read timeout to 15m (1065)
* Unpin `Werkzeug` from `v0.x` (1067)

* Pin troposphere version and update to 3.x (1029)
* Relax stage name restrictions when not using apigateway (993)
* Wait for lambda to become active during deploy/update (992)
* add support for Python 3.9 (1026)

* Deprecated ACME v1 for Lets Encrypt
* Global black formatting
* Update & deploy using a docker container
* See [blog post](https://ianwhitestone.work/zappa-serverless-docker/) for more details on the current functionality and how it works
* See [PR](https://github.com/zappa/Zappa/pull/967) or [original issue](https://github.com/Miserlou/Zappa/issues/2188) for discussion around what is currently supported & next steps

* Remove dateutil version restriction
* Fix failed downloads of wheel packages with non-alphanumeric characters
* Last release from Miserlou/Zappa
* Removed references to zappa.io

* Lambda Layers
* Cognito support
* Skip venv check if --no_venv argument is passed
* Fix for abi3 filename matching
* Wait for the Load Balancer to become active before proceeding
* Add option 'Scheme' for alb config
* Allow full path exclusions while packaging
* Workaround for werkzeug incompatibility
* And assorted fixes