Riprova

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* Deprecate asyncio.corouting
* Drop Python 2 and 3.4 support

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* Merge pull request 20 from ffix/forward-exception-instance
* Correct linter warnings
* Re-raise exception instance instead of new exception with no args
* Merge pull request 19 from EdwardBetts/spelling
* Correct spelling mistakes.
* feat(setup): support Python 3.7
* feat(History): add version changes

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* fix(17): handle as legit retriable error Timeout exceptions.

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* Merge pull request 15 from jstasiak/allow-newer-six
* Allow newer six
* feat(History): update changes

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* merge(14): Allow subsecond maxtimes for ExponentialBackoff

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* refactor(retry): remove unnecessary partial function
* fix(retry): rename keyword param for partial application
* feat(docs): improve description
* refactor(Makefile): update publish task