Add mention to latest released version

wooorm · wooorm · commit 70f9631298eb · 2017-06-12T19:24:16.000+02:00
diff --git a/readme.md b/readme.md
@@ -13,7 +13,7 @@ This document explains some terminology relating to [**unified**][unified] and
 [**vfile**][vfile] as well.
 
 This document may not be released. See [releases][] for released
-documents.
+documents. The latest released version is [`1.0.0`](https://github.com/syntax-tree/unist/releases/tag/1.0.0).
 
 ## Table of Contents
 
