feat: Add support for queueMicrotask (Closes #13)

Signed-off-by: Richie Bendall <richiebendall@gmail.com>

README.md

@@ -4,7 +4,8 @@
 To be used in environment agnostic modules that need nextTick functionality.
 
 - When run in Node.js `process.nextTick` is used
-- In modern browsers microtask resolution is guaranteed by `MutationObserver`
+- In modern browsers, microtask resolution is guaranteed by `queueMicrotask`
+- In older browsers, `MutationObserver` is used as a fallback 
 - In other engines `setImmediate` or `setTimeout(fn, 0)` is used as fallback.
 - If none of the above is supported module resolves to `null`
 

index.js

@@ -48,6 +48,11 @@ module.exports = (function () {
 		return process.nextTick;
 	}
 
+	// queueMicrotask
+	if (typeof queueMicrotask === "function") {
+		return function (cb) { queueMicrotask(ensureCallable(cb)) }
+	}
+
 	// MutationObserver
 	if ((typeof document === 'object') && document) {
 		if (typeof MutationObserver === 'function') return byObserver(MutationObserver);