Thai-segmenter

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* Refactor tasks into ``tasks.py`` to enable better import in case of embedding thai-segmenter into other projects.
* Have it almost release ready. :-)
* Add some more parameters to functions (optional header detection function)
* Flesh out ``README.rst`` with examples and descriptions.
* Add Changelog items.

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* Many changes, ``bumpversion`` needs to run where ``.bumpversion.cfg`` is located else it silently fails ...
* Strip Typehints and add support for Python3.5 again.
* Add CLI tasks for cleaning, sentseg, tokenize, pos-tagging.
* Add various params, e. g. for selecting columns, skipping headers.
* Fix many bugs for TravisCI (isort, flake8)
* Use iterators / streaming approach for file input/output.

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* Remove support of Python 2.7 and lower equal to Python 3.5 because of Typehints.
* Added CLI skeleton.
* Add really good ``setup.py``. (with ``black``, ``flake8``)

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* First release version as package.