add a note about local debian repository to pkg/README
add a note about local debian repository to pkg/README

beni55/disco,ErikDubbelboer/disco,ktkt2009/disco,pavlobaron/disco_playground,discoproject/disco,pombredanne/disco,mwilliams3/disco,oldmantaiter/disco,scrapinghub/disco,pombredanne/disco,seabirdzh/disco,discoproject/disco,mozilla/disco,seabirdzh/disco,discoproject/disco,beni55/disco,pombredanne/disco,oldmantaiter/disco,seabirdzh/disco,simudream/disco,mozilla/disco,pombredanne/disco,pooya/disco,ErikDubbelboer/disco,ErikDubbelboer/disco,discoproject/disco,oldmantaiter/disco,pooya/disco,pooya/disco,pooya/disco,mwilliams3/disco,ktkt2009/disco,beni55/disco,mwilliams3/disco,beni55/disco,seabirdzh/disco,ErikDubbelboer/disco,simudream/disco,simudream/disco,mozilla/disco,pavlobaron/disco_playground,beni55/disco,simudream/disco,discoproject/disco,oldmantaiter/disco,mwilliams3/disco,ktkt2009/disco,scrapinghub/disco,pombredanne/disco,ktkt2009/disco,seabirdzh/disco,scrapinghub/disco,mwilliams3/disco,simudream/disco,oldmantaiter/disco,ErikDubbelboer/disco,scrapinghub/disco,pavlobaron/disco_playground,mozilla/disco,ktkt2009/disco,pavlobaron/disco_playground