Update CONTRIBUTING.md

[mpcsb]

small typo

Description

Types of change

Checklist

• [x] I ran the tests, and all new and existing tests passed.
• [ ] My changes don't require a change to the documentation, or if they do, I've added all required information.
• [ ] My changes requires the reindexing of the current indexes.

[mpcsb]

small typo

[codecov[bot]]

Codecov Report

Merging #50 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #50   +/-   ##
=======================================
  Coverage   38.66%   38.66%           
=======================================
  Files          27       27           
  Lines        1438     1438           
  Branches      192      192           
=======================================
  Hits          556      556           
  Misses        852      852           
  Partials       30       30

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