Merge branch 'master' of https://github.com/encode/starlette

Merge branch 'master' of https://github.com/encode/starlette

* 'master' of https://github.com/encode/starlette: (56 commits)
  Version 0.12.7
  Version 0.12.6
  multipart: fallback to latin-1 on decode error
  utf-8 is better for default multipart encoding
  Version 0.12.5
  Version 0.12.4
  Black-ify
  Setting a finish size to SpooledTemporaryFile.
  Fix test case for https redirects
  Update httpsredirect.py
  Version 0.12.3
  ci: Travis: re-add py38
  Move assignments to help mypy
  Linting
  Fix collapse button control initial states
  Tweak exception debug HTML
  Removed rogue newline
  Added datasette-auth-github to third party middleware
  Version 0.12.2
  Version 0.12.1
  ...