autoclean: Add autoclean to bash completion

completions/bash/apt

@@ -14,6 +14,10 @@ _apt()
         "install" "remove" "purge" "autoremove"
         "update"
         "upgrade" "full-upgrade" "dist-upgrade"
+        "download" "source"
+        "build-dep"
+        "changelog"
+        "autoclean" "clean"
         "edit-sources"
         "help")
 
@@ -87,6 +91,11 @@ _apt()
                 _filedir "*.deb"
                 return 0
                 ;;
+            download|source|build-dep|changelog)
+                COMPREPLY=( $( apt-cache --no-generate pkgnames "$cur" \
+                    2> /dev/null ) )
+                return 0
+                ;;
             edit-sources)
                 COMPREPLY=( $( compgen -W '$( command ls $sourcesdir )' \
                     -- "$cur" ) )