Add ChangeLog entry for md_info getter

Signed-off-by: Max Fillinger <max@max-fillinger.net>
diff --git a/ChangeLog.d/md_info_from_ctx.txt b/ChangeLog.d/md_info_from_ctx.txt
new file mode 100644
index 0000000..f8ec1a0
--- /dev/null
+++ b/ChangeLog.d/md_info_from_ctx.txt
@@ -0,0 +1,3 @@
+Features
+   * Add a function to extract message digest information from a message
+     digest context.