Fixed security alert from npm

Author: rahsheen

package-lock.json

@@ -7,6 +7,7 @@
     "test": "jest"
   },
   "dependencies": {
+    "merge": "^1.2.1",
     "react": "16.6.0-alpha.8af6728",
     "react-native": "0.57.3"
   },
@@ -19,4 +20,4 @@
   "jest": {
     "preset": "react-native"
   }
-}
+}