Migrate to syntax-tree

Author: wooorm

package.json

@@ -11,8 +11,8 @@
     "util",
     "utility"
   ],
-  "repository": "https://github.com/wooorm/hast-util-heading",
-  "bugs": "https://github.com/wooorm/hast-util-heading/issues",
+  "repository": "https://github.com/syntax-tree/hast-util-heading",
+  "bugs": "https://github.com/syntax-tree/hast-util-heading/issues",
   "author": "Titus Wormer <tituswormer@gmail.com> (http://wooorm.com)",
   "contributors": [
     "Titus Wormer <tituswormer@gmail.com> (http://wooorm.com)"

readme.md

@@ -43,22 +43,22 @@ Check if the given value is a [**heading**][spec] [element][].
 
 <!-- Definition -->
 
-[build-badge]: https://img.shields.io/travis/wooorm/hast-util-heading.svg
+[build-badge]: https://img.shields.io/travis/syntax-tree/hast-util-heading.svg
 
-[build-page]: https://travis-ci.org/wooorm/hast-util-heading
+[build-page]: https://travis-ci.org/syntax-tree/hast-util-heading
 
-[coverage-badge]: https://img.shields.io/codecov/c/github/wooorm/hast-util-heading.svg
+[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/hast-util-heading.svg
 
-[coverage-page]: https://codecov.io/github/wooorm/hast-util-heading?branch=master
+[coverage-page]: https://codecov.io/github/syntax-tree/hast-util-heading?branch=master
 
 [npm]: https://docs.npmjs.com/cli/install
 
 [license]: LICENSE
 
 [author]: http://wooorm.com
 
-[node]: https://github.com/wooorm/hast#node
+[node]: https://github.com/syntax-tree/unist#node
 
-[element]: https://github.com/wooorm/hast#element
+[element]: https://github.com/syntax-tree/hast#element
 
 [spec]: https://html.spec.whatwg.org/#heading-content