Update mdast-util-definitions

Author: wooorm

package.json

@@ -31,8 +31,8 @@
   "dependencies": {
     "collapse-white-space": "^1.0.0",
     "detab": "^2.0.0",
-    "mdast-util-definitions": "^1.2.0",
-    "mdurl": "^1.0.1",
+    "mdast-util-definitions": "^2.0.0",
+    "mdurl": "^1.0.0",
     "trim-lines": "^1.0.0",
     "unist-builder": "^2.0.0",
     "unist-util-generated": "^1.0.0",