adding pm2 as a dev dependancy

Author: mpsido

package.json

@@ -30,6 +30,7 @@
     "eslint": "^4.6.1",
     "eslint-config-airbnb-base": "^12.0.0",
     "eslint-plugin-import": "^2.7.0",
+    "pm2": "^2.9.3",
     "pre-commit": "^1.2.2"
   }
 }