v2020.07.0 protected

Kyle Sunden

@ksunden

ad85271f · Merge branch 'prep_rel' into 'master' · Jul 31, 2020

Release: v2020.07.0

### Fixed
- Signature of `update_file`
- Variable name `file_id` when formatting urls

### Changed
- Now uses Avro-RPC [YEP-107](https://yeps.yaq.fyi/107/)
- Uses Flit for distribution