Prepare HISTORY.md for develpment of next version

Author: sudar

HISTORY.md

@@ -4,6 +4,10 @@ A Makefile for Arduino Sketches
 The following is the rough list of changes that went into different versions.
 I tried to give credit whenever possible. If I have missed anyone, kindly add it to the list.
 
+### In Development
+
+- Tweak: Looks for submenu items first when parsing BOARDS_TXT (Issue #347) (https://github.com/sej7278)
+
 ### 1.5 (2015-04-07)
 - New: Add support for new 1.5.x library layout (Issue #275) (https://github.com/lukasz-e)
 - New: Add support for 1.5.x vendor/hardware architecture library location (Issue #276) (https://github.com/lukasz-e)