Kotori

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- Attempt to fix dependency woes with the "idna" package

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- Fix HTTP handler after upgrade to Twisted 18.9.0
- Add missing "service_identity" module Twisted complained about and rebalance dependencies

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- Fix Debian package dependencies

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- Improve documentation

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- Fix wrong Trove classifiers in ``setup.py`` blocking the upload to PyPI

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- [io] Add "datetime" field to list of valid timestamp fields on data ingress
- [:ref:`vendor-luftdaten.info`] Move Luftdatenpumpe to https://github.com/hiveeyes/luftdatenpumpe
- Delete NaN values from ingress payload. Thanks, wtf!
- Implement UNIX Epoch time precision detection heuristics for ingress timestamps. Thanks, wtf!
- [package] Use Docker for Debian package building