Temporarily imit keyring version for all <3.6 python versions

[bsipocz]

Well, apparently it was the same issue as the ones in #1103

The limits btw may be removed soon as the fix is already been merged, see #1122

[astropy-bot]

Hi there @bsipocz 👋 - thanks for the pull request! I'm just a friendly 🤖 that checks for issues related to the changelog and making sure that this pull request is milestoned and labeled correctly. This is mainly intended for the maintainers, so if you are not a maintainer you can ignore this, and a maintainer will let you know if any action is required on your part 😃.

Everything looks good from my point of view! 👍

If there are any issues with this message, please report them here.

[bsipocz]

This should come back all green!

[codecov]

Codecov Report

Merging #1123 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1123   +/-   ##
=======================================
  Coverage   64.16%   64.16%           
=======================================
  Files         139      139           
  Lines       11228    11228           
=======================================
  Hits         7204     7204           
  Misses       4024     4024

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[bsipocz]

Green all the way! 🎉