Smos

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- Changed the default variables reshuffled for SMOS L2 and added option to select variables

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- Add support for SMOS L4 RZSM product (`PR 11 <https://github.com/TUW-GEO/smos/pull/11>`_)
- Update pyscaffold to v4, Replace Travis CI with GithubActions (`PR 11 <https://github.com/TUW-GEO/smos/pull/11>`_)
- Add support for SMOS L2 product
- Add scripts for operational data updates of SMOS L2 (download and time series extension)

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- Add option read data for spatial subsets
- Add option to add time stamps to time series index
- Add function to write images/stacks down
- Add function to reshuffle by bounding box
- Update docs and travis, automatic pypi deployment
- Update tests
- By default also reshuffle if Scene_Flag is 2
- Switch to pyscaffold 3 package structure
- Drop support for python 2

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- First version of L3 SMOS IC image and TS reader
- Include time series reshuffling
- Include tests and CI
- Basic documentation