update publications

Author: Paul M. Jones

README.md

@@ -10,7 +10,7 @@ the quality and consistency of their own work.
 
 ## Publications
 
-- [pds/skeleton](https://github.com/php-pds/skeleton/tree/1.0.0-alpha1) 1.0.0-alpha1
+- [pds/skeleton](https://github.com/php-pds/skeleton/tree/1.0.0-beta2) 1.0.0-beta2
 
 ## Usage