update changelog

CHANGELOG

@@ -1,3 +1,9 @@
+2019-10-15 Version 1.4
+Remove global jack transport stop on normal program exit
+Provide icons in all common sizes
+Submenus now have OK and Cancel buttons, not only shortcuts.
+Various bugfixes.
+
 2019-07-15 Version 1.3
 Add "Invert Row" to pattern context menu, if clicked on a step.
 Add "Clear Row" to pattern context menu, if clicked on a step.