Yaspin

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* Optimization: wait of stop event instead of sleep
* Update dependencies

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* Update cli-spinners to ``v2.5.0``
* Add support for Python 3.9

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* Add ``hidden()`` context manager 68
* fix(70): ``hidden()`` exceptions handling
* Replace coveralls.io with codecov.io
* Update dependencies

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* "Stabilize" yaspin; ``1.*`` branch will contain stable release with Python 2
support. Drop Python 2 and switch to Python 3 completely is planned for versions
``2.*``.

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* Update cli-spinners to ``v2.4.0``
* Update dependencies
* fix(59): remove ``tests/`` and ``examples/`` from wheels distribution

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* Migrate to ``poetry`` for dependencies management, building and publishing project
* Add tests for Python 3.8
* Deprecate support for Python 3.4
* Run tests under Ubuntu 18.04
* Update dev dependencies to the most recent ones (compatible with Python 2.7)
* Remove Tox from the project (use CI for tests under different versions of Python)