Bug fixes
- Mailgun: Support metadata in opened/clicked/unsubscribed tracking webhooks, and fix potential problems if metadata keys collided with Mailgun event parameter names. (See #76, #77)
Other changes
- Internal: Rework Anymail's ParsedEmail class and rename to EmailAddress to align it with similar functionality in the Python 3.6 email package, in preparation for future inbound support. ParsedEmail was not documented for use outside Anymail's internals (so this change does not bump the semver major version), but if you were using it in an undocumented way you will need to update your code.