Release 0.8
This release includes the following changes:
- Handle TCP/HTTPS errors in ACME directory requests
- Bump acme to the latest version shipped in stretch-backports
- Bump josepy to the latest version shipped in stretch-backports
- Allow specifying authorized hosts and regex in the config
Bug: T209980
Bug: T213820
Bug: T213301
Change-Id: Ic53816e31e6cfb16dc95175a446c88de4fbc6e44