Add changelog entry for #3127: ssl_context_info

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/ChangeLog.d/ssl_context_info.txt b/ChangeLog.d/ssl_context_info.txt
new file mode 100644
index 0000000..6a15061
--- /dev/null
+++ b/ChangeLog.d/ssl_context_info.txt
@@ -0,0 +1,3 @@
+Features
+   * The new utility programs/ssl/ssl_context_info prints a human-readable
+     dump of an SSL context saved with mbedtls_ssl_context_save().