chore: add object-assign back to deps

Author: s-panferov

package.json

@@ -34,6 +34,7 @@
     "colors": "^1.1.2",
     "loader-utils": "^0.2.6",
     "lodash": "^4.13.1",
+    "object-assign": "^4.1.0",
     "source-map-support": "^0.4.0"
   },
   "devDependencies": {