…open into patch-2

* 'develop' of https://github.com/RaRe-Technologies/smart_open:
  Propagate __exit__ call to underlying filestream (piskvorky#786)
  Retry finalizing multipart s3 upload (piskvorky#785)
  Fix `KeyError: 'ContentRange'` when received full content from S3 (piskvorky#789)
  Add support for SSH connection via aliases from `~/.ssh/config` (piskvorky#790)
  Make calls to smart_open.open() for GCS 1000x faster by avoiding unnecessary GCS API call (piskvorky#788)
  Add zstandard compression feature (piskvorky#801)
  Support moto 4 & 5 (piskvorky#802)
  Secure the connection using SSL when connecting to the FTPS server (piskvorky#793)
  upgrade dev status classifier to stable (piskvorky#798)
  Fix formatting of python code (piskvorky#795)

…open into patch-2

* 'develop' of https://github.com/RaRe-Technologies/smart_open:
  fix test, for real this time
  update integration test
  Add advanced usage sections to README.rst (piskvorky#741)
  Add logic for handling large files in MultipartWriter uploads to s3 (piskvorky#796)
  Fix __str__ method in SinglepartWriter (piskvorky#791)