Release 7.2.0

* All code is now published as es5, allowing front-end builds to
  apply tree-shaking without worrying about transpiling es6.
* Corrected a mistake in the TypeScript type definitions which
  caused the default export from Fluture to be typed incorrectly.
* Fixed an issue where TypeScript would not recognize that the
  return values of generator functions conform to Fluture's
  Iterator interface.

Author: Avaq