v3.9 CHANGELOG entry

Author: softwareengineerprogrammer

CHANGELOG.rst

@@ -8,11 +8,11 @@ GEOPHIRES-X (2023-2025)
 3.9
 ^^^
 
-.. TODO/WIP stub
+`release <https://github.com/NREL/GEOPHIRES-X/releases/tag/v3.9.7>`__
 
-`release <https://github.com/NREL/GEOPHIRES-X/releases/tag/v3.9.5>`__
+v3.9 adds the `SAM Single Owner PPA Economic Model <https://softwareengineerprogrammer.github.io/GEOPHIRES/SAM-Economic-Models.html>`__
 
-SAM Single-owner PPA Economic Model
+.. TODO switch link to nrel.github.io version once merged into main repo
 
 
 3.8