Update unist-util-visit

Author: wooorm

package.json

@@ -24,7 +24,7 @@
     "index.js"
   ],
   "dependencies": {
-    "unist-util-visit": "^1.1.0"
+    "unist-util-visit": "^2.0.0"
   },
   "devDependencies": {
     "browserify": "^16.0.0",