Update CONTRIBUTING.md
Update CONTRIBUTING.md

Fix link
tombeynon/mountain_view,darioghilardi/pieces-engine,jgnatch/mountain_view,darioghilardi/pieces-engine,jgnatch/mountain_view,devnacho/mountain_view,gazaston/mountain_view,darioghilardi/pieces-engine,tombeynon/mountain_view,gazaston/mountain_view,tombeynon/mountain_view,devnacho/mountain_view,jgnatch/mountain_view,devnacho/mountain_view,gazaston/mountain_view