chore: fix changelog header
# ChangeLog
-* **0.25-SNAPSHOT**
+* **0.25.0** (2018-05-16)
- Always create missing target directory for docker:save ([#1013](https://github.com/fabric8io/docker-maven-plugin/issues/1013))
- d-m-p plugins for adding extra files introduced. See documentation for more information.
- Update assembly plugin to 3.1.0 ([#1021](https://github.com/fabric8io/docker-maven-plugin/issues/1021))
