Merge branch 'develop' of github.com:sampotts/plyr into develop

# Conflicts:
#	package.json
#	yarn.lock

src/js/utils/elements.js

@@ -221,7 +221,7 @@ export function hasClass(element, className) {
 
 // Element matches selector
 export function matches(element, selector) {
-    const prototype = { Element };
+    const {prototype} = Element;
 
     function match() {
         return Array.from(document.querySelectorAll(selector)).includes(this);

src/js/utils/is.js

@@ -19,7 +19,7 @@ const isEvent = input => instanceOf(input, Event);
 const isKeyboardEvent = input => instanceOf(input, KeyboardEvent);
 const isCue = input => instanceOf(input, window.TextTrackCue) || instanceOf(input, window.VTTCue);
 const isTrack = input => instanceOf(input, TextTrack) || (!isNullOrUndefined(input) && isString(input.kind));
-const isPromise = input => instanceOf(input, Promise);
+const isPromise = input => instanceOf(input, Promise) && isFunction(input.then);
 
 const isEmpty = input =>
     isNullOrUndefined(input) ||

src/js/utils/promise.js

@@ -0,0 +1,14 @@
+import is from './is';
+/**
+ * Silence a Promise-like object.
+ * This is useful for avoiding non-harmful, but potentially confusing "uncaught
+ * play promise" rejection error messages.
+ * @param  {Object} value An object that may or may not be `Promise`-like.
+ */
+export function silencePromise(value) {
+    if (is.promise(value)) {
+        value.then(null, () => {});
+    }
+}
+
+export default { silencePromise };