Merge pull request #147 from hexojs/dependabot/npm_and_yarn/hexo-fs-tw-2.0.0

Update hexo-fs requirement from ^1.0.0 to ^2.0.0

Author: curbengh

package.json

@@ -38,7 +38,7 @@
   "dependencies": {
     "bluebird": "^3.5.0",
     "chalk": "^2.4.1",
-    "hexo-fs": "^1.0.0",
+    "hexo-fs": "^2.0.0",
     "hexo-util": "^1.0.0",
     "moment": "^2.18.0",
     "swig-templates": "^2.0.2"