Ported version of starlette to run on Python 3.5

Install

python3 -m pip install git+https://github.com/em92/starlette

Notes

Comparing to original starlette it doesn't give you:

1. 100% type annotated codebase
2. Zero hard dependencies.

Reasons of above is Python 3.5:

1. Till 3.5.4 exclusively does not have type annotation typing.AsyncGenerator. See commit f691b60784abee7d4aa0fad3ef2da64783cb8c30
2. async_generator package is required to port functions, that are used as async generators (yield inside async function is supported in 3.6+).