Replace Bing layer with MapTiler

examples/region-growing.html

@@ -23,10 +23,10 @@ docs: >
     This example also shows how an additional function can be made available
     to the operation.
   </p>
-tags: "raster, region growing"
+tags: "raster, region growing, 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" style="cursor: pointer"></div>
 <table class="controls">