update readme for 1.4.0

only show zombie error once

readme: known issue with psutil

wrap chrome process finding in try/except

psutil has issue with zombie processes. should be fixed in 5.4.5

add install message

add is_instance_connected to simplify is_enabled checks

use GotoWindow to focus window back on ST

debug print case

remove reload page ignore cache key command

remove reload page ignore cache key command