Add ChangeLog entry for ChachaPoly ciphersuites

fixes #346
diff --git a/ChangeLog b/ChangeLog
index 23f4291..3cbccd7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,8 +4,9 @@
 
 Features
    * Add new crypto primitives from RFC 7539: stream cipher Chacha20, one-time
-   authenticator Poly1305 and AEAD construct Chacha20-Poly1305. Contributed by
-   Daniel King (#485).
+     authenticator Poly1305 and AEAD construct Chacha20-Poly1305. Contributed
+     by Daniel King (#485).
+   * Add support for CHACHA20-POLY1305 ciphersuites from RFC 7905.
 
 = mbed TLS 2.11.0 branch released 2018-06-18