Updated changelog

Changelog.txt

@@ -1,8 +1,10 @@
 v4.0 (development)
 	- Folders can now be dropped in the project browser to open them as a project.
+	- UI: Tabs can now be moved between panes in order to customize the workspace.
 	- Improved search panel. Now you can also search in non-active projects.
 	- Improved run toolbar.
 	- Improved build indicator.
+	- Improved auto completion responsiveness.
 	- Updated documentation (Humdinger).
 	- Added a status bar to show build status.	
 	- Added option for smaller icons, and made icons scale with font size.
@@ -13,6 +15,7 @@ v4.0 (development)
 	- ProjectBrowser: added handling of DEL key to delete files.
 	- Improve confusing alert name when creating a new branch.
 	- Editor status bar: use a fixed font.
+	- Read and use build target name when using Haiku standard makefile.
 	- Avoid converting end lines when opening files.
 	- Fixed concurrency issue which could cause settings corruption.
 	- Fixed random hang when running/debugging applications from Genio.