Fix typo

Author: wooorm

Diff for: readme.md

@@ -44,7 +44,7 @@ Get the start or end points in the positional info of `node`.
 
 ## Contribute
 
-See [`contribute.md` in `syntax-tree/unist`][contribute] for ways to get
+See [`contributing.md` in `syntax-tree/unist`][contributing] for ways to get
 started.
 
 This organisation has a [Code of Conduct][coc].  By interacting with this
@@ -76,6 +76,6 @@ repository, organisation, or community you agree to abide by its terms.
 
 [point]: https://github.com/syntax-tree/unist#point
 
-[contribute]: https://github.com/syntax-tree/unist/blob/master/contributing.md
+[contributing]: https://github.com/syntax-tree/unist/blob/master/contributing.md
 
 [coc]: https://github.com/syntax-tree/unist/blob/master/code-of-conduct.md