Fix typo in CONTRIBUTING.md
Fix typo in CONTRIBUTING.md

Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,cysjonathan/coursemology2,cysjonathan/coursemology2,cysjonathan/coursemology2