Update extensions.js

Author: TheShovel

src/lib/extensions.js

@@ -76,7 +76,7 @@ export default [
         name: "Doodle Recognition",
         description: "A implementation of Google's Quick Draw image vision model",
         code: "TheShovel/doodlerec.js",
-        banner: "TheShovel/thumbnail_doodlerec.png",
+        banner: "TheShovel/thumbnail-doodlerec.png",
         creator: "TheShovel",
         isGitHub: true,
     },