Resolves #345

[axunonb]

Changes:

• PluralLocalizationFormatter does not treat numeric string as valid argument (i.e. estore behavior of v3.1.0 and before)
• Bump version to v3.2.2
• Update appveyor and github workflow CI

[axunonb]

@karljj1 Would you pls have a look?
See SonarCloud checks here: https://sonarcloud.io/summary/new_code?id=axunonb_SmartFormat&branch=pr%2Fplural-fmt-string-arg
And I'd be more than happy if you joined the project as a co-maintainer if your time allows

[codecov]

Codecov Report

Patch coverage: 100% and no project coverage change.

Comparison is base (c8a99c0) 96% compared to head (36680c3) 96%.

❗ Current head 36680c3 differs from pull request most recent head 32f5211. Consider uploading reports for the commit 32f5211 to get more accurate results

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #346   +/-   ##
===================================
- Coverage    96%    96%   -0%     
===================================
  Files        91     91           
  Lines      3191   3190    -1     
===================================
- Hits       3077   3076    -1     
  Misses      114    114           

Files Changed	Coverage Δ
...rtFormat/Extensions/PluralLocalizationFormatter.cs	92% <100%> (-<1%)	⬇️

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[karljj1]

I'd be happy to help maintain. I probably won't be able to do much development but I'm happy to review pull requests and help out when I can.