Fix downloads count badge

[pricklypointer]

Fixed the download count badge using https://juliapkgstats.com/. The current badge is broken because the old API and PkgVisBoard is not maintained.

This PR:

• Replaces the broken badge with a new badge that uses the new API

Please review and provide any feedback. Thanks for considering this PR!

Attribution

• I am listed in .zenodo.json (see How to get acknowledged #3503)

Things to consider

• Does it work on log scales?
• Does it work in layouts?
• Does it work in recipes?
• Does it work with multiple series in one call?
• PR includes or updates tests?
• PR includes or updates documentation?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.42%. Comparing base (fa65e7d) to head (9e18d4c).
Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4922      +/-   ##
==========================================
- Coverage   89.77%   89.42%   -0.36%     
==========================================
  Files          40       40              
  Lines        8780     8792      +12     
==========================================
- Hits         7882     7862      -20     
- Misses        898      930      +32     

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[t-bltg]

Awesome @pricklypointer thanks for your contribution!