Update models.py

models.py

@@ -1,5 +1,5 @@
 def return_sum_models(language):
-    if language in ["php", "python", "java", "ruby", "javascript", "go"]:
+    if language in ["php", "python", "java", "ruby", "javascript", "go", "cpp"]:
         return f"nam194/codet5sum_{language}"
     return ""