Prevent pkill commands to go to rank high

Thank you for the nice working on this project. I use rofi many times to kill programs, but i find that it sometimes puts pkill commands higher ranked as the original commands. I find this incovenient. 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.