Update CONTRIBUTING.md

[Bondcoder]

The variable name needs to be PAT_1 (or PAT_X up to 8). It throws an error when you use "PAT".

[vercel]

@Bondcoder is attempting to deploy a commit to the github readme stats Team on Vercel.

A member of the Team first needs to authorize it.

[codecov]

Codecov Report

Merging #848 (a5c2762) into master (15afa65) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #848   +/-   ##
=======================================
  Coverage   93.96%   93.96%           
=======================================
  Files          22       22           
  Lines         679      679           
  Branches      189      189           
=======================================
  Hits          638      638           
  Misses         37       37           
  Partials        4        4           

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[anuraghazra]

Thanks for the fix! @Bondcoder