CHANGELOG.md switch to v4.5.0.

CHANGELOG.md

 Changelog
 =========
 
+v4.5.0
+------
+**NekMesh**:
+- Add periodic boundary condition meshing in 2D (!733)
+- Automatic peralign call if periodic boundary conditions present (!733)
+- Support non-O BL meshing in 2D (!733)
+
 v4.4.0
 ------
 **Library**:
@@ -95,9 +102,6 @@ v4.4.0
   (!712)
 - 2D to 3D mesh extrusion module (!715)
 - Add new two-dimensional mesher from NACA code or step file (!720)
-- Add periodic boundary condition meshing in 2D (!733)
-- Automatic peralign call if periodic boundary conditions present (!733)
-- Support non-O BL meshing in 2D (!733)
 - Fix inverted boundary layer in 2D (!736)
 - More sensible element sizing with boundary layers in 2D (!736)
 - Change variable names in mcf file to make more sense (!736)