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**Features and Improvements**
- Made decision of the API design. Make it stable and consistent to all attributes
- Add ``pynamodb_mate.EncryptedNumberAttribute``, ``pynamodb_mate.EncryptUnicodeAttribute``, ``pynamodb_mate.EncryptBinaryAttribute``, ``pynamodb_mate.EncryptedJsonAttribute``, ``pynamodb_mate.S3BackedBigBinaryAttribute``, ``pynamodb_mate.S3BackedBigTextAttribute``, ``pynamodb_mate.CompressedJSONAttribute``, ``pynamodb_mate.CompressedUnicodeAttribute``, ``pynamodb_mate.CompressedBinaryAttribute`` to public API
**Minor Improvements**
- Improve documentations.
**Miscellaneous**
- It maintain the compatibility to major version of ``pynamodb`` library. For example ``pynamodb_mate>=5.0.0,<6.0.0`` is compatible to ``pynamodb>=5.0.0,<6.0.0``.
- Drop support for Python2.7 because ``pynamodb`` drops 2.7 support.