Added missing CHANGELOG entry for feature/Interpolator

CHANGELOG.md

@@ -8,6 +8,8 @@ v4.4.0
   Galerkin discretisation (!604)
 - Add support for variable polynomial order with periodic boundary conditions
   (!658)
+- Sped up interpolataion from pts files and fixed parallel pts import (!584)
+- Increased required boost version to 1.56.0 (!584)
 
 **IncNavierStokesSolver:**
 - Add ability to simulate additional scalar fields (!624)