Update RELEASE.md

Author: Goooler

RELEASE.md

@@ -2,6 +2,9 @@
 - mvn versions:display-dependency-updates
 - mvn versions:display-plugin-updates
 - update CHANGELOG.md
+  1. Change the `Unreleased` header to the release version.
+  2. Add a link URL to ensure the header link works.
+  3. Add a new `Unreleased` section to the top.
 - change version in pom.xml
 - push and wait for build
 - create tag jdependency-VERSION