Update fs-extra to version 5.0.0 (#183)

Author: greenkeeper[bot]

package.json

@@ -20,7 +20,7 @@
     "chalk": "^2.1.0",
     "chokidar": "^1.6.1",
     "dependency-graph": "^0.7.0",
-    "fs-extra": "^4.0.1",
+    "fs-extra": "^5.0.0",
     "get-stdin": "^5.0.1",
     "globby": "^7.1.1",
     "ora": "1.3.0",