[SKIP CI] Updated the releases notes for 3.0-3 tag

ReleaseNotes.md

+# v3.0-3
+
+## Summary
+
+### Modification
+
+- The cta-statistics-update tool updates the tape statistics one by one
+
 # v3.0-2
 
 ## Summary

cta.spec.in

@@ -461,6 +461,8 @@ Currently contains a helper for the client-ar script, which should be installed
 %attr(0755,root,root) /usr/bin/cta-client-ar-abortPrepare
 
 %changelog
+* Wed Jun 24 2020 julien.leduc (at) cern.ch - 3.0-3
+- The cta-statistics-update tool updates tape statistics one by one
 * Wed Jun 24 2020 julien.leduc (at) cern.ch - 3.0-2
 - Upstream eos 4.8.3-1
 - Upstream xrootd 4.12.3-1