chore(package): update @types/fs-extra to version 4.0.4 (#51)

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "aws lambda"
   ],
   "devDependencies": {
-    "@types/fs-extra": "4.0.3",
+    "@types/fs-extra": "4.0.4",
     "@types/jest": "^21.1.1",
     "@types/lodash": "^4.14.62",
     "jest": "^21.2.1",