Add entry in ChangeLog

Add an entry in the ChangeLog, describing the fix.
diff --git a/ChangeLog b/ChangeLog
index 0d5ae5a..03b3cab 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -7,6 +7,9 @@
      Philippe Antoine.
    * Clarify documentation for mbedtls_ssl_write() to include 0 as a valid
      return value. Found by @davidwu2000. #839
+   * Add ecc extensions only if an ecc based ciphersuite is used.
+     Affects interoperability with BouncyCastle and other peers.
+     Raised by milenamil in #1157.
 
 Changes
    * Change the shebang line in Perl scripts to look up perl in the PATH.