Add repology badge for package manager versions

[zbeekman]

• Repology provides version information for all available package mangers

coverage on master

Summary of changes

Summarize what you changed

Rationale for changes

Why did you make these changes?

Additional info and certifications

This pull request (PR) is a:

• Bug fix
• Feature addition
• Other, Please describe:

I certify that

• I certify that:
  • I have reviewed and followed the contributing guidelines
  • I will wait at least 24 hours before self-approving the PR to give another
    OpenCoarrays developer a chance to review my proposed code
  • I have not introduced errant white space (no trailing white space or white space errors may
    be introduced)
  • I have added an explanation of what these changes do and why they should be included
  • I have checked to ensure there aren't other open Pull Requests for the same change
  • I have you written new tests for these changes
  • I have successfully tested these changes locally
  • I have commented any non-trivial, non-obvious code changes
  • The commits are logically atomic, self consistent and coherent
  • The commit messages follow best practices
  • Test coverage is maintained or increased after this is merged

Code coverage data

[codecov]

Codecov Report

Merging #671 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #671   +/-   ##
=======================================
  Coverage   57.07%   57.07%           
=======================================
  Files           4        4           
  Lines        3222     3222           
=======================================
  Hits         1839     1839           
  Misses       1383     1383