finalize release 2.2.0

[IAlibay]

Towards #3560

Changes made in this Pull Request:

• Finalize the 2.2.0 release

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

[codecov]

Codecov Report

Merging #3690 (8eaf9dd) into develop (0b5b8ab) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #3690      +/-   ##
===========================================
+ Coverage    94.31%   94.35%   +0.03%     
===========================================
  Files          191      191              
  Lines        24975    24975              
  Branches      3365     3365              
===========================================
+ Hits         23556    23565       +9     
+ Misses        1370     1362       -8     
+ Partials        49       48       -1     

Impacted Files	Coverage Δ
package/MDAnalysis/version.py	100.00% <100.00%> (ø)
package/MDAnalysis/converters/RDKit.py	98.74% <0.00%> (+0.31%)	⬆️
package/MDAnalysis/converters/RDKitParser.py	96.96% <0.00%> (+0.75%)	⬆️
package/MDAnalysis/coordinates/H5MD.py	97.61% <0.00%> (+1.67%)	⬆️

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