Mangum

* Exclude `tests/` directory from package. [200](https://github.com/jordaneremieff/mangum/pull/200). Thanks [bradsbrown](https://github.com/bradsbrown)!

* Make `boto3` optional [197](https://github.com/jordaneremieff/mangum/pull/197).

* Reintroduce WebSocket support [190](https://github.com/jordaneremieff/mangum/pull/190). Thanks [eduardovra](https://github.com/eduardovra)!

* Resolve several issues with ALB/ELB support [184](https://github.com/jordaneremieff/mangum/pull/184), [#189](https://github.com/jordaneremieff/mangum/pull/189), [#186](https://github.com/jordaneremieff/mangum/pull/186), [#182](https://github.com/jordaneremieff/mangum/pull/182). Thanks [nathanglover](https://github.com/nathanglover) & [jurasofish](https://github.com/jurasofish)!

* Refactor handlers to be separate from core logic [170](https://github.com/jordaneremieff/mangum/pull/170). Thanks [four43](https://github.com/four43)!

* Remove deprecated `enable_lifespan` parameter [109](https://github.com/jordaneremieff/mangum/issues/109).

* Include API Gateway v2 event cookies in scope headers [153](https://github.com/jordaneremieff/mangum/pull/153). Thanks [araki-yzrh](https://github.com/araki-yzrh)!

* Support ELB and fix APIGW v2 cookies response [155](https://github.com/jordaneremieff/mangum/pull/155). Thanks [araki-yzrh](https://github.com/araki-yzrh)!

* Add flake8 to CI checks [157](https://github.com/jordaneremieff/mangum/pull/157). Thanks [emcpow2](https://github.com/emcpow2)!

* Add type hints for lambda handler context parameter [158](https://github.com/jordaneremieff/mangum/pull/158). Thanks [emcpow2](https://github.com/emcpow2)!

* Extract ASGI scope creation into function [162](https://github.com/jordaneremieff/mangum/pull/162). Thanks [emcpow2](https://github.com/emcpow2)!

* Remove WebSocket support to focus on HTTP [127](https://github.com/jordaneremieff/mangum/issues/127).

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

* Fix duplicate test names [134](https://github.com/jordaneremieff/mangum/pull/134). Thanks [a-feld](https://github.com/a-feld)!

* Run tests and release package using GitHub Actions [131](https://github.com/jordaneremieff/mangum/issues/131). Thanks [simonw](https://github.com/simonw)!

* Only prefix a slash on the api_gateway_base_path if needed [138](https://github.com/jordaneremieff/mangum/pull/138). Thanks [dspatoulas](https://github.com/dspatoulas)!

* Add support to Brotli compress [139](https://github.com/jordaneremieff/mangum/issues/139). Thanks [fullonic](https://github.com/fullonic)!

* Make boto3 dependency optional [115](https://github.com/jordaneremieff/mangum/pull/115)