Fix ChangeLog

Fixes the ChangeLog following the merge of the ECP HW acceleration interfaces
in aab9efb.
diff --git a/ChangeLog b/ChangeLog
index 9cc5683..b85f9d1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -9,7 +9,9 @@
      Found and fix proposed by Michael Schwarz, Samuel Weiser, Daniel Gruss,
      Clémentine Maurice and Stefan Mangard.
 
-Feature
+Features
+   * Exposed parts of the Elliptic Curve Point internal interface, to provide
+     interface for external hardware acceleration code.
    * Add a new configuration option to 'mbedtls_ssl_config' to enable
      suppressing the CA list in Certificate Request messages. The default
      behaviour has not changed, namely every configured CAs name is included.
@@ -86,10 +88,6 @@
    * Fix unlisted DES configuration dependency in some pkparse test cases. Found
      by inestlerode. #555
 
-Features
-   * Exposed parts of the Elliptic Curve Point internal interface, to provide
-     interface for external hardware acceleration code.
-
 = mbed TLS 2.4.1 branch released 2016-12-13
 
 Changes