Prevent commands starting with pkill,  from ranking high in the history

Thank you for the nice working on this project. I use rofi many times to kill programs, thus many times the pkill command is higher ranked than the original command. I find this inconvenient. I think these should be in the cache history but not rank high. For this reason I created a simple modification of your source. what it does is it checks if pkill is in the command to be run and if so it puts index =1.