Fix missing shortweekdays and shortmonths for date-fns

[jperelli]

This PR fixes empty month pickers and missing weekday names in daypicker when using with date-fns

[vercel]

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[codecov]

Codecov Report

Merging #126 into master will decrease coverage by 0.30%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   99.59%   99.29%   -0.31%     
==========================================
  Files          45       45              
  Lines        1969     1978       +9     
  Branches      587      587              
==========================================
+ Hits         1961     1964       +3     
- Misses          6       12       +6     
  Partials        2        2              

Impacted Files	Coverage Δ
src/generate/dateFns.ts	88.00% <33.33%> (-12.00%)	⬇️

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[fgblomqvist]

This is a duplicate of #115 (and I'd argue that #115's implementation is better). @afc163 wanna weigh in?

[jperelli]

I agree, I did the PR without knowing the existence of the other one. Sometimes you don't have any pull request, sometimes you have 2 to choose 🤷

[afc163]

@fireairforce

[jperelli]

closing in favor of #115