remove duplidate 8.4.9 version history item.
remove duplidate 8.4.9 version history item.

htcondor/htcondor,htcondor/htcondor,neurodebian/htcondor,htcondor/htcondor,neurodebian/htcondor,htcondor/htcondor,neurodebian/htcondor,htcondor/htcondor,neurodebian/htcondor,htcondor/htcondor,neurodebian/htcondor,neurodebian/htcondor,neurodebian/htcondor,neurodebian/htcondor,htcondor/htcondor,htcondor/htcondor,neurodebian/htcondor