Update CHANGELOG.md

Author: mrubens

CHANGELOG.md

@@ -5,7 +5,7 @@
 - Make information about the conversation's context window usage visible in the task header for humans and in the environment for models (thanks @MuriloFP!)
 - Add checkboxes to auto-approve mode switch requests (thanks @MuriloFP!)
 - Add new experimental editing tools `insert_content` (for inserting blocks of text at a line number) and `search_and_replace` (for replacing all instances of a phrase or regex) to complement diff editing and whole file editing (thanks @samhvw8!)
-- Improved DeepSeek R1 support by capturing reasoning from DeepSeek API as well as more OpenRouter variants, stop using system messages, and fixing a crash on empty chunks. Still depends on the DeepSeek API staying up but we'll be in a better place when it does! (thanks @Szpadel!)
+- Improved DeepSeek R1 support by capturing reasoning from DeepSeek API as well as more OpenRouter variants, not using system messages, and fixing a crash on empty chunks. Still depends on the DeepSeek API staying up but we'll be in a better place when it does! (thanks @Szpadel!)
 
 ## [3.3.4]