Update CHANGELOG for Emoji fix in a3c6ed5c

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CHANGELOG

@@ -42,6 +42,7 @@ v 8.1.0 (unreleased)
   - Add "Quick Submit" behavior to input fields throughout the application. Use
     Cmd+Enter on Mac and Ctrl+Enter on Windows/Linux.
   - Fix position of hamburger in header for smaller screens (Han Loong Liauw)
+  - Fix bug where Emojis in Markdown would truncate remaining text (Sakata Sinji)
 v 8.0.4
   - Fix Message-ID header to be RFC 2111-compliant to prevent e-mails being dropped (Stan Hu)