updated CHANGELOG.md

CHANGELOG.md

@@ -92,6 +92,12 @@ v4.4.0
 - Change variable names in mcf file to make more sense (!736)
 - Fix issues in varopti module so that in can be compiled without meshgen on
   (!736)
+- Replace LAPACK Eigenvalue calculation with handwritten function in 
+  varopti (!738)
+- Improved node-colouring algorithm for better load-balancing 
+  in varopti (!738)
+- Simplified calculation of the energy functional in varopti for improved
+  performance (!738)
 
 **FieldConvert:**
 - Move all modules to a new library, FieldUtils, to support post-processing