Bugfix/mark citations

[creisle]

BugFIxes:

• 9

Removes support in tests for python 3.6 and adds python 3.11 due to GitHub Actions no longer supporting python 3.6

[codecov-commenter]

Codecov Report

Patch coverage: 75.00% and project coverage change: +1.21 :tada:

Comparison is base (32bddca) 85.17% compared to head (19cce75) 86.39%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #15 +/- ## ========================================== + Coverage 85.17% 86.39% +1.21% ========================================== Files 5 5 Lines 668 669 +1 ========================================== + Hits 569 578 +9 + Misses 99 91 -8 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `86.39% <75.00%> (+1.21%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jake+Lever#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/jakelever/biotext/pull/15?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jake+Lever) | Coverage Δ | | |---|---|---| | [src/bioconverters/pmcxml.py](https://codecov.io/gh/jakelever/biotext/pull/15?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jake+Lever#diff-c3JjL2Jpb2NvbnZlcnRlcnMvcG1jeG1sLnB5) | `88.54% <50.00%> (+3.64%)` | :arrow_up: | | [src/bioconverters/utils.py](https://codecov.io/gh/jakelever/biotext/pull/15?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jake+Lever#diff-c3JjL2Jpb2NvbnZlcnRlcnMvdXRpbHMucHk=) | `89.55% <100.00%> (+0.55%)` | :arrow_up: | 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=Jake+Lever). 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=Jake+Lever)

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[jakelever]

All looks good