Squashed 'packages/mr/' changes from 9836013..3c53659


git-subtree-dir: packages/mr
git-subtree-split: 3c536591d54cca7528e18f8943ad6c508638879f
Update Mr to v0.15.5
Merge pull request #1466 from Stuk/mr0.15.5

Mr v0.15.5