message: Fixed deb changelog date abbrev.
diff: @@ -2,7 +2,7 @@ seafile-gui (6.0.7) unstable; urgency=low
  * new upstream release
  - -- Jonathan Xu <jonathan.xu@seafile.com> Tue, 20 June 2017 16:37:10 +0800
  + -- Jonathan Xu <jonathan.xu@seafile.com> Tue, 20 Jun 2017 16:37:10 +0800
  seafile-gui (6.0.6) unstable; urgency=low
  * new upstream release
  