docs: fixed usage example

ruyadorno · ruyadorno · commit d2c8734d1d7f · 2021-07-05T11:48:24.000-04:00
diff --git a/README.md b/README.md
@@ -43,7 +43,10 @@ await pkgJson.save()
 //   "dependencies": {
 //     "a": "^1.0.0",
 //     "b": "^1.2.3"
-//   }
+//   },
+//   "workspaces": [
+//     "./new-workspace"
+//   ]
 // }
 ```
 
