Update info for issues
Rename Contributing.md to CONTRIBUTING.md
Remove opening angle bracket restriction in text
Merge branch 'master' of github.com:Fyrd/caniuse
data update
data update
Update spec link

Update the spec link and avoid pointing to the spec twice.
Update srcset spec link
data update
Merge pull request #677 from zcorpan/patch-1

Update spec link
Merge pull request #678 from zcorpan/patch-2

Update srcset spec link