fixed link for lab01 in lab04
fixed link for lab01 in lab04

ucsb-cs8-f17/ucsb-cs8-f17.github.io,ucsb-cs8-f17/ucsb-cs8-f17.github.io,ucsb-cs8-f17/ucsb-cs8-f17.github.io,ucsb-cs8-f17/ucsb-cs8-f17.github.io,ucsb-cs8-f17/ucsb-cs8-f17.github.io