Separate Promise implementation from polyfilling

docs/change-log.md

@@ -47,6 +47,13 @@
 
 ---
 
+### v1.1.7
+
+- Promise polyfill implementation separated from polyfilling logic.
+- `PromisePolyfill` is now available on the exported/global `m`.
+
+---
+
 ### v1.1.6
 
 - core: render() function can no longer prevent from changing `document.activeElement` in lifecycle hooks ([#1988](https://github.com/MithrilJS/mithril.js/pull/1988), [@purplecode](https://github.com/purplecode))

docs/promise.md

@@ -26,6 +26,8 @@ A [ES6 Promise](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/G
 
 A Promise is a mechanism for working with asynchronous computations.
 
+Mithril provides a polyfill when the environment does not support Promises. The polyfill can also be referenced specifically via `m.PromisePolyfill`.
+
 ---
 
 ### Signature