Bump mem-fs-editor to 9.0.0 (#1298)

Author: mshima

package-lock.json

@@ -28,8 +28,8 @@
     "coveralls": "^3.0.3",
     "inquirer": "^7.3.2",
     "jsdoc": "^3.6.3",
-    "mem-fs": "^2.0.0",
-    "mem-fs-editor": "^8.1.2",
+    "mem-fs": "^2.1.0",
+    "mem-fs-editor": "^9.0.0",
     "mocha": "^8.0.1",
     "mockery": "^2.1.0",
     "nock": "^13.0.2",