Update upgrade instructions for 0.5.1
Update upgrade instructions for 0.5.1

evanv/titan,xlcupid/titan,qiuqiyuan/titan,nvoron23/titan,nvoron23/titan,evanv/titan,elkingtonmcb/titan,jankotek/titan,kangkot/titan,kalatestimine/titan,anuragkh/titan,xlcupid/titan,evanv/titan,xlcupid/titan,xlcupid/titan,evanv/titan,evanv/titan,jamestyack/titan,ThiagoGarciaAlves/titan,fengshao0907/titan,elkingtonmcb/titan,anuragkh/titan,kalatestimine/titan,qiuqiyuan/titan,ThiagoGarciaAlves/titan,ThiagoGarciaAlves/titan,tomersagi/titan,elkingtonmcb/titan,jamestyack/titan,wangbf/titan,hortonworks/titan,nvoron23/titan,wangbf/titan,mwpnava/titan,kalatestimine/titan,elkingtonmcb/titan,jamestyack/titan,ThiagoGarciaAlves/titan,mwpnava/titan,qiuqiyuan/titan,anuragkh/titan,hortonworks/titan,jankotek/titan,wangbf/titan,hortonworks/titan,wangbf/titan,hortonworks/titan,tomersagi/titan,jankotek/titan,tomersagi/titan,fengshao0907/titan,ThiagoGarciaAlves/titan,elkingtonmcb/titan,mwpnava/titan,fengshao0907/titan,anuragkh/titan,jamestyack/titan,mwpnava/titan,jankotek/titan,anuragkh/titan,qiuqiyuan/titan,kangkot/titan,kangkot/titan,xlcupid/titan,fengshao0907/titan,kangkot/titan,jamestyack/titan,fengshao0907/titan,nvoron23/titan,kangkot/titan,jankotek/titan,kalatestimine/titan,tomersagi/titan,qiuqiyuan/titan,mwpnava/titan,wangbf/titan,tomersagi/titan,hortonworks/titan,kalatestimine/titan