Version 3.6.1 release candidate.

[sobolevnrm]

See #349 for associated issue.

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (ca3ff01) 65.39% compared to head (dab5772) 65.39%.

:exclamation: Current head dab5772 differs from pull request most recent head b6d6fbf. Consider uploading reports for the commit b6d6fbf to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #352 +/- ## ======================================= Coverage 65.39% 65.39% ======================================= Files 30 30 Lines 7789 7789 ======================================= Hits 5094 5094 Misses 2695 2695 ``` | [Impacted Files](https://codecov.io/gh/Electrostatics/pdb2pqr/pull/352?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Electrostatics) | Coverage Δ | | |---|---|---| | [pdb2pqr/\_version.py](https://codecov.io/gh/Electrostatics/pdb2pqr/pull/352?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Electrostatics#diff-cGRiMnBxci9fdmVyc2lvbi5weQ==) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Electrostatics). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Electrostatics)

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[sobolevnrm]

This is a documentation fix; merging without review.