fix(package): update lodash to version 4.17.4

Closes #44

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
   },
   "homepage": "https://github.com/stampit-org/react-stamp#readme",
   "dependencies": {
-    "lodash": "4.17.1",
+    "lodash": "4.17.4",
     "stamp-utils": "1.3.2"
   },
   "devDependencies": {