Remove south migration
One pgcrypto for one field
Rename fields
Update README
Update README.md [ci skip]
Update docstrings and remove default for `EncryptedProxyField`.
Add note on how to use annonate
Test get field descriptor
Merge pull request #12 from incuna/clean-code

Simplify code
Add lookup
Update CHANGELOG.md
Update README.md
Update setup.py