Clear out the release notes for the next release

ReleaseNotes.md

@@ -1,10 +1,8 @@
-These notes are for release **5.3.1**. Other releases and their notes can be found at the [tfs-plugin GitHub Releases](https:/jenkinsci/tfs-plugin/releases) page.
-
+These notes are for release **(to be determined)**.
+Other releases and their notes can be found at the [tfs-plugin GitHub Releases](https:/jenkinsci/tfs-plugin/releases) page.
+
 * Major:
- * Add a global configuration option to select the user account name mapping strategy. Thanks to @smalik86 and @smoyen for helping design and test the changes in pull request #140.
- * Fix exception when invoked from TFS Release Management (JENKINS-40283). Thanks to @DavidStaheli for pull request #142.
- * JENKINS-40155: Fix event's scope deserialization, via pull request #143.
- * Pushes without commits are ignored. Thanks to @CSchulz, @cniweb and @DavidStaheli for their help in fixing this defect via pull request #141.
-
+ * TODO
 * Minor:
- * Clarified documentation on SCM trigger configuration. Thanks to @CSchulz for pull request #139.
+ * TODO
+