update 'Example use' with new output and demonstrate multi-CPU speedup
update 'Example use' with new output and demonstrate multi-CPU speedup

micmro/imgmin,pornel/imgmin,rflynn/imgmin,pornel/imgmin,micmro/imgmin,jibsen/imgmin,jibsen/imgmin,jibsen/imgmin,jibsen/imgmin,rflynn/imgmin,pornel/imgmin,micmro/imgmin,pornel/imgmin,micmro/imgmin,rflynn/imgmin,rflynn/imgmin