fix(package): update fs-extra to version 7.0.1

Closes #1585

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "compare-sets": "1.0.1",
     "dugite": "^1.79.0",
     "event-kit": "2.5.2",
-    "fs-extra": "4.0.3",
+    "fs-extra": "7.0.1",
     "graphql": "0.13.2",
     "keytar": "4.2.1",
     "lodash.memoize": "4.1.2",