Create workflow to publish project on PyPI when released

[rennerocha]

When Travis was removed, the steps to deploy new versions on PyPI was removed too. This PR includes a new workflow that will publish to PyPI every time a new release is made.

@Gallaecio , I don't have access, but probably we already have these secrets configured for this repository, am I right?

[codecov]

Codecov Report

Merging #911 (61e090c) into master (255c421) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #911   +/-   ##
=======================================
  Coverage   98.26%   98.26%           
=======================================
  Files         231      231           
  Lines        2597     2597           
=======================================
  Hits         2552     2552           
  Misses         45       45           

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[Gallaecio]

@Gallaecio , I don't have access, but probably we already have these secrets configured for this repository, am I right?

I’ve added it now :)

[Gallaecio]

@noviluni Just for your information: with this change, the package is deployed to PyPI when a release entry is created in GitHub, in https://github.com/scrapinghub/dateparser/releases, not when a version tag is pushed.

[noviluni]

Nice! I think it's time to release a new version, so I will merge it just before doing it and will see if it works :)

thanks both @Gallaecio @rennerocha