Update index.html

index.html

@@ -291,6 +291,20 @@
               return "css";
             case "md":
               return "markdown";
+            case "rs":
+              return "rust";
+            case "go"
+              return "go";
+            case "cpp":
+              return "cpp";
+            case "h":
+              return "cpp";
+            case "json":
+              return "json";
+            case "xml":
+              return "xml";
+            case "py":
+              return "python";
             default:
               return "text/plain";
           }