Following issues/PRs were fixed for this release:

* #244: Allow list & str for comparison
* #236: Add missing deprecated functions
* #235: Shift focus on semver.VersionInfo.*
* #228: Add better doctest integration into pytest
* #225: Deprecate module level functions
* #224: Replace super() call (#226)
* #222: Implement of VersionInfo.next_version() function
* #138: Implement `__getitem__`

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* README.rst: Remove :ref: role as it gives problems in twine
* setup.py: add project URLs
* Amend list of contributors
* Mention how to install semver from master
* tox.ini: added prepare-dist target to create distribution (whl
  and .tar.gz) and check with "twine check"

Co-authored-by: Sebastien Celles <scls19fr@users.noreply.github.com>