updated the stable page link

Author: mkstoyanov

README.md

@@ -5,7 +5,7 @@ The Toolkit for Adaptive Stochastic Modeling and Non-Intrusive ApproximatioN is
 Visit us at: [https://tasmanian.ornl.gov/](https://tasmanian.ornl.gov/) and
 [https://github.com/ORNL/Tasmanian](https://github.com/ORNL/Tasmanian)
 
-[Documentation: v7.0 (latest stable)](https://tasmanian.ornl.gov/documentation/)
+[Documentation: v7.1 (latest stable)](https://ornl.github.io/TASMANIAN/stable/)
 
 [Documentation: development (rolling)](https://ornl.github.io/TASMANIAN/)