Add support for changes in mdast-slug

...but the old one is still supported.

Author: wooorm

index.js

@@ -310,7 +310,12 @@ function gatherExposedFactory() {
             cache[filePath] = true;
 
             visit(ast, 'heading', function (node) {
-                var id = node.attributes && node.attributes.id;
+                var data = node.data || {};
+                var attributes = data.htmlAttributes || {};
+                var id = attributes.id || data.id;
+
+                /* istanbul ignore next */
+                id = id || (node.attributes && node.attributes.id);
 
                 hasHeadings = true;
 

package.json

@@ -13,7 +13,7 @@
   ],
   "dependencies": {
     "github-url-to-object": "^1.5.2",
-    "mdast-slug": "^1.0.0",
+    "mdast-slug": "^2.0.0",
     "mdast-util-definitions": "^1.0.0",
     "unist-util-visit": "^1.0.0",
     "propose": "0.0.5",