Replace Bing layer with MapTiler

examples/image-filter.html

@@ -6,10 +6,10 @@ docs: >
   <p>Layer rendering can be manipulated in <code>prerender</code> and <code>postrender</code> event listeners.
   These listeners get an event with a reference to the Canvas rendering context.
   In this example, the <code>postrender</code> listener applies a filter to the image data.</p>
-tags: "filter, image manipulation"
+tags: "filter, image manipulation, maptiler"
 cloak:
-  - key: As1HiMj1PvLPlqc_gtM7AqZfBL8ZL3VrjaS3zIb22Uvb9WKhuJObROC-qUpa81U5
-    value: Your Bing Maps Key from http://www.bingmapsportal.com/ here
+  - key: get_your_own_D6rA4zTHduk6KOKTXzGB
+    value: Get your own API key at https://www.maptiler.com/cloud/
 ---
 <div id="map" class="map"></div>
 <select id="kernel" name="kernel">