Update CHANGELOG.md

Fix issue 523, use version 4.5 in changelog since there's no 4.4.1 public distro

CHANGELOG.md

@@ -4,13 +4,14 @@ GitHub issues or pull requests that
 are related to the items below. If there is no issue or pull
 request related to the change, then we may provide the commit.
 
-v4.4.1
+v4.5
 ======
 - Fix issue [#1378](https://github.com/opensim-org/opensim-gui/issues/1378): In Static Optimization Tool, dialog box has wrong title for "Directory" in output section.
 - Fix issue [#1395](https://github.com/opensim-org/opensim-gui/issues/1395): Where visual selection and properties windows are not in sync.
 - Fix issue [#1357](https://github.com/opensim-org/opensim-gui/issues/1357): Toolbar displaced and non visible after resizing window
 - Fix issue [#1416](https://github.com/opensim-org/opensim-gui/issues/1416): Remove visual offset added to experimental data in "Preview Experimnetal Data".
 - Fix issue [#1426](https://github.com/opensim-org/opensim-gui/issues/1426): Make graphical selection of pathpoints and markers more robust among overlapping objects.
+- Fix issue [#523](https://github.com/opensim-org/opensim-gui/issues/523): Keep visualizer alive through arbitrary long idle time.
 
 v4.4
 ====