Add a link to StableLib.

README.md

@@ -3,6 +3,16 @@ Package uniuri
 
 [![Build Status](https://travis-ci.org/dchest/uniuri.svg)](https://travis-ci.org/dchest/uniuri)
 
+Stable version
+--------------
+
+**A stable version of this package with commercial support is available
+through StableLib: <https://stablelib.com/v1/uniuri/>**
+
+
+Development version
+-------------------
+
 ```go
 import "github.com/dchest/uniuri"
 ```
@@ -94,4 +104,3 @@ The author(s) have dedicated all copyright and related and
 neighboring rights to this software to the public domain
 worldwide. Distributed without any warranty.
 http://creativecommons.org/publicdomain/zero/1.0/
-