Update CHANGELOG.md
Update Changelog for recently merged PRs.
# Changelog
## 0.8.3-dev
+ - fix code documentation, requests are async and require await
+ - properly support setting host when registering task set
## 0.8.2 July 2, 2020
- `client.log_debug()` will write debug logs to file when specified with `--debug-log-file=`
