Add fix and credit for #742 to the ChangeLog
diff --git a/ChangeLog b/ChangeLog
index 4ccba2f..03bad2c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -46,6 +46,9 @@
      missing calls to pem_free() in cases when a
      POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT error was encountered. Found and
      fix proposed by Guido Vranken. #722
+   * Fixed the templates used to generate project and solution files for Visual
+     Studio 2015 as well as the files themselves, to remove a build warning
+     generated in Visual Studio 2015. Reported by Steve Valliere. #742
 
 = mbed TLS 1.3.18 branch 2016-10-17