Update pt-br.js

[jonashenrique90]

This PR improves the weekdaysMin for brazilian portuguese.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 100.00%. Comparing base (27b3f61) to head (188c4eb). :warning: Report is 228 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##               dev     #1846   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          180       180           
  Lines         2034      2034           
  Branches       524       524           
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  Hits          2034      2034           

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[iamkun]

I'll mark this PR to wait for some native speaker review.

also you can check https://github.com/moment/moment/blob/develop/src/locale/pt-br.js as a reference

[Garccez]

I'm a Brazilian Portuguese native speaker, the improved weekdaysMin this guy made is indeed more used than the one in use by DayJS ;)

[yanpgabriel]

I'm also a native speaker and I can confirm that using 2ª, 3ª, 4ª, 5ª, and 6ª is not at all conventional.