* Support for Python 3.8
* Separated out `uvicorn.error` and `uvicorn.access` logs.
* Coloured log output when connected to a terminal.
* Dropped `logger=` config setting.
* Added `--log-config [FILE]` and `log_config=[str|dict]`. May either be a Python logging config dictionary or the file name of a logging configuration.
* Added `--forwarded_allow_ips` and `forwarded_allow_ips`. Defaults to the value of the `$FORWARDED_ALLOW_IPS` environment variable or "127.0.0.1". The `--proxy-headers` flag now defaults to `True`, but only trusted IPs are used to populate forwarding info.
* The `--workers` setting now defaults to the value of the `$WEB_CONCURRENCY` environment variable.
* Added support for `--env-file`. Requires `python-dotenv`.