added post-merge hook for npm install

package.json

@@ -34,7 +34,8 @@
   "husky": {
     "hooks": {
       "pre-commit": "lint-staged",
-      "pre-push": "npm test"
+      "pre-push": "npm test",
+      "post-merge": "npm install"
     }
   },
   "lint-staged": {