Minor Changes
- Declare packages side-effect free for tree-shaking (#1577), thanks @maclockard
- HTML5Backend: Make file metadata available on dragstart event (#1610), thanks @LeopoldLerch
- TestBackend: Add DragDropManager accessor to TestBackend (#1564), thanks @ezr-ondrej
Patch Changes
- Improve UMD builds to conform to browserslist support target, add some basic UMD verification tests