Update notes for submitted changes

* [spotbugs] Fix potential NPE in FileRepository#convertToReftable

a2/bb540f2998689ae9c7f894ca5d74c6c55f9127

@@ -0,0 +1,7 @@
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: Christian Halstrick <christian.halstrick@sap.com>
+Submitted-by: Christian Halstrick <christian.halstrick@sap.com>
+Submitted-at: Thu, 17 Dec 2020 15:15:27 -0500
+Reviewed-on: https://git.eclipse.org/r/c/jgit/jgit/+/173364
+Project: jgit/jgit
+Branch: refs/heads/master