Update ChangeLog for PR #730 for Win32 API fixes

Signed-off-by: Simon Butcher <simon.butcher@arm.com>
diff --git a/ChangeLog b/ChangeLog
index bc1d32e..f3c13a2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3016,6 +3016,8 @@
    * Clarify the documentation of mbedtls_ssl_setup.
    * Use (void) when defining functions with no parameters. Contributed by
      Joris Aerts. #678
+   * Update Win32 APIs used to remove those not permitted by the Windows Store.
+     Fix provided by Kevin Kane, Microsoft. #635
 
 = mbed TLS 2.7.0 branch released 2018-02-03