No reason to do string replacement, just use a text node

Author: tjcrowder

snippet.js

@@ -1,6 +1,6 @@
 // MIT license, see: https://github.com/tjcrowder/simple-snippets-console/blob/master/LICENSE
 var snippet = {
-    version: "1.2",
+    version: "1.3",
 
     // Writes out the given text in a monospaced paragraph tag, escaping
     // & and < so they aren't rendered as HTML.
@@ -13,7 +13,7 @@ var snippet = {
         } else if (typeof msg === "object") {
             msg = msg === null ? "null" : JSON.stringify(msg);
         }
-        elm.innerHTML = msg.replace(/&/g, '&amp;').replace(/</g, '&lt;');
+        elm.appendChild(document.createTextNode(msg));
         document.body.appendChild(elm);
     },