Release notes:

- ad4d2d6 Add type definitions for the promise build. This should automatically
  work when you import `clipboard-polyfill/build/clipboard-polyfill.promise` in
  TypeScript now.
- c063af7 Attempt IE strategy second. This allows `clipboard-polyfill` to work
  in modern browsers even if `window.clipboardData` and
  `window.clipboardData.setData` are defined for some reason.