fix: grammar stuff with the checkupdates script

bspwm/checkupdates.sh

@@ -12,8 +12,9 @@ count=$(cat /tmp/checkupdates)
 status="$count updates"
 if [[ $count -eq 0 ]]; then
   status="Up to date"
+elif [[ $count == "1" ]]; then
+  status="$count update"
 fi
-
 echo "$status"
 
 upd & disown