Merge branch 'fix/Changelog' into 'master'

Fix/changelog

This just adds missing entries to the changelog. When cherry-picked to the release branch this should also remove a duplicate header which appeared there for v4.3.4.

See merge request !686

CHANGELOG.md

@@ -60,6 +60,9 @@ v4.3.4
 **Library:**
 - Fix performance issue with `v_ExtractDataToCoeffs` for post-processing of large
   simulations (!672)
+- Added additional assertions to ensure homogeneous simulations have an even
+  number of planes per process (!666)
+- Fix compilation with NEKTAR_USE_MESHGEN option
 
 v4.3.3
 ------