parity: Release version 0.8.0
parity: Release version 0.8.0

Release notes:

https://github.com/thoughtbot/parity/releases/tag/v0.8.0

Using sha256 per `brew create` instructions in:

https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/Formula-Cookbook.md#grab-the-url

thoughtbot/homebrew-formulae