Re-add diff

Author: thomashohn

package.json

@@ -201,6 +201,7 @@
     "tmp": "0.2.5",
     "js-yaml": "^4.1.1",
     "serialize-javascript": "7.0.3",
+    "diff": "8.0.3",
     "axios": "1.13.6"
   }
 }