Update for new Iodide renderer API

src/pyodide.js

@@ -370,8 +370,13 @@ var languagePluginLoader = new Promise((resolve, reject) => {
     document.getElementsByTagName('head')[0].appendChild(link);
 
     // Add a custom output handler for Python objects
+<<<<<<< HEAD
     self.iodide.addOutputHandler({
       shouldHandle : (val) => {
+=======
+    window.iodide.addOutputRenderer({
+      shouldRender : (val) => {
+>>>>>>> Update for new Iodide renderer API
         return (typeof val === 'function' &&
                 pyodide._module.PyProxy.isPyProxy(val));
       },
@@ -396,7 +401,7 @@ var languagePluginLoader = new Promise((resolve, reject) => {
           div.appendChild(pre);
           element = div;
         }
-        return element;
+        return element.outerHTML;
       }
     });
   }