update README, add new Related Project to list

[reatlat]

I just include my small helper class and WP function to Related Projects
you can find the wp-php-feather here https://github.com/reatlat/wp-php-feather

[codecov]

Codecov Report

Merging #1021 (45dc471) into master (8263ca9) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #1021   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines           34        34           
  Branches         3         3           
=========================================
  Hits            34        34           

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[colebemis]

🎉