Updated changelog

Author: Johan Lofstad - M19936

CHANGELOG.md

@@ -8,8 +8,10 @@
 
 * Added sensor driver shutdown to lower power examples
 * Refactored sandbox to use modulo instead of masking
+* Added a simple CLI for the sandbox
 
 ## Bugfixes
 
 * Fixed a bug where the board buttons were disabled during sleep, and could not wake up the MCU
-* Removed configuring button as input again after not disabling it
+* Removed configuring button as input again after not disabling it
+* Fixed a bug where flow control was not correctly applied when the receive buffer was full. This particularly affected the sandbox.