Add unist-util-find to list of utilities

Author: wooorm

readme.md

@@ -147,6 +147,8 @@ A list of **vfile**-related utilities can be found at [**vfile**][vfile].
 *   [`unist-util-filter`](https://github.com/eush77/unist-util-filter)
     — Create a new Unist tree with all nodes that pass the test
     implemented by the provided function;
+*   [`unist-util-find`](https://github.com/blahah/unist-util-find)
+    — Find a node by condition;
 *   [`unist-util-find-after`](https://github.com/wooorm/unist-util-find-after)
     — Find a node after another node;
 *   [`unist-util-find-all-after`](https://github.com/wooorm/unist-util-find-all-after)