Fix bogus date
    
    fedpkg lint will be happy with this patch
    
    sh$ fedpkg lint
    warning: bogus date in %changelog: Fri Sep 23 2010 Stephen Gallagher <sgallagh@redhat.com> - 0.1.1-2
    
    No srpm found
    warning: bogus date in %changelog: Fri Sep 23 2010 Stephen Gallagher <sgallagh@redhat.com> - 0.1.1-2
    No rpm found
    /tmp/ding-libs/ding-libs.spec: E: specfile-error warning: bogus date in %changelog: Fri Sep 23 2010 Stephen Gallagher <sgallagh@redhat.com> - 0.1.1-2
    0 packages and 1 specfiles checked; 1 errors, 0 warnings.
    Could not execute lint: Command 'rpmlint /tmp/ding-libs/ding-libs.spec' returned non-zero exit status 64