v0.3.0

Changed

• The "main" build is now a UMD module which can be used both in Node.js
  and directly the browser. In the latter case, Redux Preboiled is exposed
  as a global named reduxPreboiled.

• All builds (except the esnext one) are now transpiled to ES5, which makes
  them work in older browsers (most notably Internet Explorer 11).