- Be more specific about included filepaths in %files
- Add Requires on python-google-filesystem, and stop including a file it
now ships.

- Update to 1.3.0:
- allow RetryStrategy to be configured with a custom initial
wait and multiplier
- add support for Python 3.9, drop support for Python 3.5
- add retries for 'requests.ConnectionError'
- add _async_resumable_media experimental support
- allow space in checksum header
- lint: blacken 5 files
- bump 'google-crc32c >= 1.0'
- pin 'google-crc32c < 0.2dev'
- update docs build (via synth)
- use googleapis.dev docs link
- add configurable checksum support for uploads
- add customizable timeouts to upload/download methods
- add configurable crc32c checksumming for downloads
- add templates for python samples projects
- update client_documentation link
- updated CHANGELOG.md
- updated setup.py