Version 1.3.1

Clean up npm packaging.

v1.3.0...v1.3.1

Version 1.3.0

• Fix bugs affecting form data that is not an instance of FormData.
• Remove use of async/await in favor of promises, to reduce transpilating needs.
• Remove use of class to reduce transpiling needs.
• Bundle in ponyfills for window.fetch, Promise, and objectAssign.