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Changed
-------
- **BACKWARD INCOMPATIBLE:** Use Elasticsearch version 6.x
- **BACKWARD INCOMPATIBLE:** Bump ``Django`` requirement to version ``2.2``
- **BACKWARD INCOMPATIBLE:** Remove not used ``django-mathfilters``
requirement
Added
-----
- Support Python 3.7
- Support forward and reverse many-to-one relations in Elasticsearch
- Add ``collection_names`` field to ``DataSerializer``
- Add test methods to ``ProcessTestCase`` that assert directory structure and
content: ``assertDirExists``, ``assertDir``, and ``assertDirStructure``
- Add ``upload-dir`` process
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