Updated ReleaseNotes.

Author: khmarbaise

ReleaseNotes.md

@@ -2,6 +2,10 @@
 
 ## Release 0.3.9 (NOT RELEASED YET)
 
+ * [Fixed Issue 401][issue-401]
+   
+   Upgrade JUnit
+
  * [Fixed Issue 400][issue-400]
 
    Upgrade assertj-core.
@@ -1100,6 +1104,7 @@ TestReport testReport = mavenJob.getLastSuccessfulBuild().getTestReport();
 [issue-396]: https://github.com/jenkinsci/java-client-api/issues/396
 [issue-399]: https://github.com/jenkinsci/java-client-api/issues/399
 [issue-400]: https://github.com/jenkinsci/java-client-api/issues/400
+[issue-401]: https://github.com/jenkinsci/java-client-api/issues/401
 [pull-123]: https://github.com/jenkinsci/java-client-api/pull/123
 [pull-149]: https://github.com/jenkinsci/java-client-api/pull/149
 [pull-158]: https://github.com/jenkinsci/java-client-api/pull/158