chore: add dev deps for example script

Author: coolaj86

package.json

@@ -31,5 +31,12 @@
   "bugs": {
     "url": "https://github.com/dashhive/DashGov.js/issues"
   },
-  "homepage": "https://github.com/dashhive/DashGov.js#readme"
+  "homepage": "https://github.com/dashhive/DashGov.js#readme",
+  "devDependencies": {
+    "@dashincubator/secp256k1": "^1.7.1-5",
+    "dashkeys": "^1.1.4",
+    "dashrpc": "^20.0.0",
+    "dashtx": "^0.18.1",
+    "dotenv": "^16.4.5"
+  }
 }