Update escape-string-regexp

Author: wooorm

package.json

@@ -21,7 +21,7 @@
     "index.js"
   ],
   "dependencies": {
-    "escape-string-regexp": "^1.0.5",
+    "escape-string-regexp": "^2.0.0",
     "hast-util-is-element": "^1.0.0",
     "is-regex": "^1.0.3",
     "isarray": "^2.0.1",