Add an introduction to the changelog

Marek Suchánek · Marek Suchánek · commit fe9be72de89b · 2022-02-28T18:51:55.000+01:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# Changelog
+
+The following is a summary of changes in each `newdoc` release, which is also a Git tag by the same name in this repository.
+
 ## v2.9.8
 
 * Remove the abstract tag from the templates. Jupiter doesn't require it.
