adjusted changelog for 2.9

CHANGES/v2.9.md

@@ -1,8 +1,8 @@
 @page CHANGES-2-9 Version 2.9
 
-## Version 2.9 beta (Mar 13, 2023)
+## Version 2.9 (May 25, 2023)
 
-This page contains changes that will end up in 2.9
+Changes from version 2.8 which are relevant for users:
 
 - Changes leading to differences with previous versions:
   - Number of bins in \ref METAD, \ref PBMETAD and \ref sum_hills is now computed correctly
@@ -37,7 +37,9 @@ This page contains changes that will end up in 2.9
   - The module now writes the .zgrad file for inspecting and debugging the $\boldsymbol{\xi}$-averaged spring forces.
 
 - New Patches:
-  - Patch for gromacs 2023 (preliminary, in particular for replica-exchange, expanded ensemble, hrex features). 
+  - Patch for GROMACS 2023 (preliminary, in particular for replica-exchange, expanded ensemble, hrex features). 
+  - Patch for QEspresso 7.0 has been added.
+  - Patch for GROMACS 2019 has been removed.
 
 - Changes relevant for developers:
   - Nested exception can be passed to calling codes using C/C++/Fortran/Python interfaces \issue{879}.