Update changelog and Bump version to 5.2.0

Author: retiutut

CHANGELOG.md

@@ -7,6 +7,7 @@
 - Fix error starting BrainFlow Streaming Board from external process #1102
 - Fix Hardware Settings button not clickable after resizing app #1132
 - Fix bug loading Session Settings related to Widget Layouts #1138
+- Fix bug caused by NullPointerException with ControlP5 Window on App Start #1150
 
 ### Improvements
 

OpenBCI_GUI/OpenBCI_GUI.pde

@@ -62,7 +62,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
 //                       Global Variables & Instances
 //------------------------------------------------------------------------
 //Used to check GUI version in TopNav.pde and displayed on the splash screen on startup
-String localGUIVersionString = "v5.2.0-alpha.1";
+String localGUIVersionString = "v5.2.0";
 String localGUIVersionDate = "June 2023";
 String guiLatestVersionGithubAPI = "https://api.github.com/repos/OpenBCI/OpenBCI_GUI/releases/latest";
 String guiLatestReleaseLocation = "https://github.com/OpenBCI/OpenBCI_GUI/releases/latest";