Bump version

Signed-off-by: Joe Grund <jgrund@whamcloud.io>

debian/changelog

-prometheus-lustrefs-exporter (0.2.0-0.1) unstable; urgency=medium
+prometheus-lustrefs-exporter (0.2.1-0.1) unstable; urgency=medium
 
   * New release.
 

lustrefs_exporter.spec

 Name:           lustrefs_exporter
-Version:        0.2.0
+Version:        0.2.1
 Release:        1%{?dist}
 Summary:        prometheus exporter for lustre
 License:        MIT