update user-visible changes

doc/source/pre/whatsnew/1.4.rst

@@ -347,9 +347,10 @@ Changes in Kwant 1.4.2
   backwards-incompatible change only affects Kwant users who use it.
 - Minor bugs were fixed in the KPM module.
 
-Changes after Kwant 1.4.2
--------------------------
+Changes in Kwant 1.4.3
+----------------------
 - Builder properly handles Hermitian conjugation of array-like values.
   Before, if the value was provided not as a true array but, for example, as a
   list of lists, it was not conjugated, which could lead to generation of a
   non-Hermitian Hamiltonian matrix without emitting any error.
+- Various maintenance.