avocado.spec: Fix bogus date

Fixes a sloppy copy and paste I made in the spec file.
Signed-off-by: NLucas Menghel Rodrigues <lmr@redhat.com>

avocado.spec

@@ -66,7 +66,7 @@ examples of how to write tests on your own.
 * Mon Oct 13 2014 Lucas Meneghel Rodrigues <lmr@redhat.com> - 0.14.0-1
 - New upstream release
 
-* Tue Sep 11 2014 Lucas Meneghel Rodrigues <lmr@redhat.com> - 0.12.0-2
+* Thu Sep 11 2014 Lucas Meneghel Rodrigues <lmr@redhat.com> - 0.12.0-2
 - Rename -tests package to -examples
 
 * Tue Sep  9 2014 Lucas Meneghel Rodrigues <lmr@redhat.com> - 0.12.0-1