Version 0.12.4

Version 0.12.3

Version 0.12.2

Version 0.12.1

Version 0.12.0

Version 0.11.0

version 0.10.0

* Remove WebSocket support to focus on HTTP. [jordaneremieff#127](jor…

…daneremieff#127)

* Support multiValue headers in response. [jordaneremieff#129](jordaneremieff#129). Thanks [@koxudaxi](https://github.com/koxudaxi)!

* Make boto3 dependency optional [jordaneremieff#115](jordaneremieff#115

)

* Refactor lifespan class to be more consistent with other cycle clas…

…ses and to be more compliant with ASGI spec

* Bugfix lifespan startup behaviour, allow lifespan cycle to be used as a context manager in the adapter [107](jordaneremieff#107).

* Deprecate `enable_lifespan` parameter to be replaced by new `lifespan` option

* Include CHANGELOG in repo and release notes in documentation [110](jordaneremieff#110)

* Update protocol classes generally with  docstrings/comments/better state transitions/more compliant with ASGI spec.

* Overhaul documentation structure and content.