Add missing comma in requirements table

[EFord36]

Closes #260

This caused Sphinx to fail to render the entire table.

After this change, the Sphinx error has gone away and the table renders:

[weibullguy]

@EFord36 would you be amenable to adding the following testenv for tox in pyproject.toml?

[testenv:docs]
description = build docformatter documentation
allowlist_externals = make
changedir = docs
commands =
    make html

Just add that between this line -> rstcheck --report-level=1 {toxinidir}/README.rst and the closing """ at the very end of the file. No worries if you don't want to, it just saves another PR. TIA

[EFord36]

sure, I'll look at that now. Thanks for letting me know the issue!

[EFord36]

@weibullguy I just pushed a new commit to the branch with that change - let me know if I've made any mistake, or you want any more explanation/detail in the commit message or anything!

[weibullguy]

sure, I'll look at that now. Thanks for letting me know the issue!

Wasn't an issue, I was just trying to get you to do something I'd have to do later! 😉