Add CHANGELOG notice

Author: josevalim

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## v1.19.0-dev
+
+This release requires Elixir v1.14+ and it bumps the recommended :strong and :compatible SSL/TLS ciphers suite to align with modern security standards, prioritizing TLS 1.3 and 1.2. Support for the insecure TLS 1.0 and 1.1 protocols are removed in accordance with RFC 8996.
+
 ## v1.18.1 (2025-07-01)
 
 ### Enhancements