[python] Link to original PR contribution for ASGI (#4448)
[python] Link to original PR contribution for ASGI (#4448)

This code was contributed by @nathancahill under MIT license but it is likely from the Mangum project, so we'll link to the relevant code as the original source, also MIT License.
zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli