doc: fix the release date of disco 0.5.3
doc: fix the release date of disco 0.5.3
ErikDubbelboer/disco,ktkt2009/disco,ErikDubbelboer/disco,ktkt2009/disco,pombredanne/disco,pombredanne/disco,pooya/disco,ErikDubbelboer/disco,beni55/disco,oldmantaiter/disco,seabirdzh/disco,simudream/disco,oldmantaiter/disco,pombredanne/disco,simudream/disco,mwilliams3/disco,pombredanne/disco,mozilla/disco,discoproject/disco,seabirdzh/disco,pooya/disco,mwilliams3/disco,mwilliams3/disco,pombredanne/disco,pooya/disco,seabirdzh/disco,discoproject/disco,ErikDubbelboer/disco,mwilliams3/disco,ErikDubbelboer/disco,simudream/disco,mozilla/disco,oldmantaiter/disco,mozilla/disco,discoproject/disco,beni55/disco,oldmantaiter/disco,simudream/disco,beni55/disco,ktkt2009/disco,seabirdzh/disco,simudream/disco,seabirdzh/disco,mozilla/disco,ktkt2009/disco,discoproject/disco,pooya/disco,discoproject/disco,oldmantaiter/disco,mwilliams3/disco,beni55/disco,ktkt2009/disco,beni55/disco