update single models download

mhcflurry/downloads.yml

@@ -25,7 +25,7 @@ releases:
               default: true
 
             - name: models_class1_allele_specific_single
-              url: http://github.com/hammerlab/mhcflurry/releases/download/0.0.8/models_class1_allele_specific_single.no_impute.tar.bz2
+              url: http://github.com/hammerlab/mhcflurry/releases/download/0.1.0-alpha1/models_class1_allele_specific_single.tar.bz2
               default: false
 
             - name: data_kim2014