Update upgrading instructions in README.md
Update upgrading instructions in README.md

heartnn/openshift-ghost-quickstart,enekofb/summer-time,openshift-quickstart/openshift-ghost-quickstart,moehub/openshift-ghost-quickstart,jasonfinch/openshift-ghost-quickstart,mrabet1/ghost,jessica-jordan/portal,joincamp/congostory-openshift,zeropaper/openshift-ghost-quickstart,heartnn/openshift-ghost-quickstart,openshift-quickstart/openshift-ghost-quickstart,guharakesh/krcle2,samternent/openshift-ghost-quickstart,joincamp/congostory-openshift,voanhcuoc/openshift-ghost-quickstart,DennisSchwartz/portal,enlore/blog.eufd,MunGell/openshift-ghost-quickstart,jessica-jordan/portal,stikmanw/blog,pranavek/ghost,cloudstrap/openshift-ghost-quickstart,nybblr/openshift-ghost-quickstart,laurieboyes/blog,joincamp/congostory-openshift,zeropaper/openshift-ghost-quickstart,moehub/openshift-ghost-quickstart,CubeKode/blog,heartnn/openshift-ghost-quickstart,enekofb/summer-time,zhaoloving/www.zlog.ml,nybblr/openshift-ghost-quickstart,openshift-quickstart/openshift-ghost-quickstart,voanhcuoc/openshift-ghost-quickstart,stikmanw/blog,guharakesh/krcle2,zhaoloving/www.zlog.ml,laurieboyes/blog,samternent/openshift-ghost-quickstart,jessica-jordan/portal,perseoq/openshift-ghost-quickstart,DennisSchwartz/portal,cloudstrap/openshift-ghost-quickstart,EkaPurnama/openshift-ghost-quickstart,MunGell/openshift-ghost-quickstart,Nixphix/ghost-blog,DennisSchwartz/portal,EkaPurnama/openshift-ghost-quickstart,strategTC/ghost,dkbhadeshiya/openshift-ghost-quickstart,perseoq/openshift-ghost-quickstart,mrabet1/ghost,perseoq/openshift-ghost-quickstart,nybblr/openshift-ghost-quickstart,enekofb/summer-time,CubeKode/blog,jasonfinch/openshift-ghost-quickstart,perseoq/openshift-ghost-quickstart,enlore/blog.eufd,Nixphix/ghost-blog,dkbhadeshiya/openshift-ghost-quickstart,pranavek/ghost,laurieboyes/blog,strategTC/ghost,MunGell/openshift-ghost-quickstart,moehub/openshift-ghost-quickstart,jasonfinch/openshift-ghost-quickstart