Update CHANGELOG.md

Firmware size optimization, skipping unused FPGA bitstreams

Author: douniwan5788

CHANGELOG.md

@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+- Firmware size optimization, skipping unused FPGA bitstreams (@douniwan5788)
 - Added MFC keys for Sofia public transport cards (@user890104)
 - Added `lf em 410x clone --hs` clone EM410x ID to Hitag S/8211 (@douniwan5788)
 - Fixed Hitag S read/write in plain mode (@douniwan5788)