Update CONTRIBUTING.md
Update CONTRIBUTING.md

gohugoio/hugo,fedelibre/hugo,gohugoio/hugo,fedelibre/hugo,anthonyfok/hugo,fedelibre/hugo,fedelibre/hugo,mdhender/hugo,mdhender/hugo,anthonyfok/hugo,mdhender/hugo,gohugoio/hugo,anthonyfok/hugo,mdhender/hugo