Fixed a syntax error in code for "From transformers>=v4.48...."

The original code forgot a comma after "{"type": "image", "url": "https://www.ilankelman.org/stopsigns/australia.jpg"}"

README.md

@@ -109,7 +109,7 @@ messages = [
     {
         "role": "user",
         "content": [
-            {"type": "image", "url": "https://www.ilankelman.org/stopsigns/australia.jpg"}
+            {"type": "image", "url": "https://www.ilankelman.org/stopsigns/australia.jpg"},
             {"type": "text", "text": "What is shown in this image?"},
         ],
     },