Squashed 'caniuse/' content from commit 752786d

git-subtree-dir: caniuse
git-subtree-split: 752786d342d57fcef37296c961933d2341b6fd6d
Merge commit 'e68c239f2c07ad2ed6430a89dda5c9ae5072d0f3' as 'caniuse'
Add .gittrees file