Fix typo

Author: wooorm

readme.md

@@ -204,7 +204,7 @@ Yields, in [HAST][] (**note**: the `pre` and `language-js` class are normal
 
 ## Contribute
 
-See [`contribute.md` in `syntax-tree/mdast`][contribute] for ways to get
+See [`contributing.md` in `syntax-tree/mdast`][contributing] for ways to get
 started.
 
 This organisation has a [Code of Conduct][coc].  By interacting with this
@@ -242,7 +242,7 @@ repository, organisation, or community you agree to abide by its terms.
 
 [remark-rehype]: https://github.com/remarkjs/remark-rehype
 
-[contribute]: https://github.com/syntax-tree/mdast/blob/master/contributing.md
+[contributing]: https://github.com/syntax-tree/mdast/blob/master/contributing.md
 
 [coc]: https://github.com/syntax-tree/mdast/blob/master/code-of-conduct.md