Edit CONTRIBUTING.md
Edit CONTRIBUTING.md

Polish numbering.

alexvision/yodel,PhongHPham/visceral-tambourine,aaronnorby/visceral-tambourine,PhongHPham/visceral-tambourine,livvielin/visceral-tambourine,visceral-tambourine/visceral-tambourine,livvielin/visceral-tambourine,alexvision/yodel,sndsgn/visceral-tambourine,aaronnorby/visceral-tambourine,sndsgn/visceral-tambourine,visceral-tambourine/visceral-tambourine