fix(deps): update dependency fs-extra to v8

Author: renovate-bot

package-lock.json

@@ -147,7 +147,7 @@
     "commander": "2.20.0",
     "cross-spawn": "6.0.5",
     "find": "0.3.0",
-    "fs-extra": "7.0.1",
+    "fs-extra": "8.0.1",
     "graphql-json-schema": "0.1.2",
     "inquirer": "6.3.1",
     "lodash": "4.17.11",