Update release notes.
Update release notes.

zeroae/postgres-xl,Postgres-XL/Postgres-XL,rubikloud/gpdb,Quikling/gpdb,pavanvd/postgres-xl,randomtask1155/gpdb,zaksoup/gpdb,ashwinstar/gpdb,randomtask1155/gpdb,kmjungersen/PostgresXL,randomtask1155/gpdb,0x0FFF/gpdb,janebeckman/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,foyzur/gpdb,edespino/gpdb,lintzc/gpdb,ahachete/gpdb,ovr/postgres-xl,janebeckman/gpdb,janebeckman/gpdb,royc1/gpdb,ovr/postgres-xl,ahachete/gpdb,royc1/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,50wu/gpdb,rvs/gpdb,janebeckman/gpdb,xuegang/gpdb,jmcatamney/gpdb,janebeckman/gpdb,rubikloud/gpdb,Chibin/gpdb,ashwinstar/gpdb,CraigHarris/gpdb,CraigHarris/gpdb,cjcjameson/gpdb,oberstet/postgres-xl,edespino/gpdb,Chibin/gpdb,Chibin/gpdb,postmind-net/postgres-xl,lisakowen/gpdb,edespino/gpdb,adam8157/gpdb,lintzc/gpdb,rubikloud/gpdb,zaksoup/gpdb,50wu/gpdb,cjcjameson/gpdb,janebeckman/gpdb,Quikling/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,postmind-net/postgres-xl,tangp3/gpdb,arcivanov/postgres-xl,lintzc/gpdb,ahachete/gpdb,cjcjameson/gpdb,tpostgres-projects/tPostgres,adam8157/gpdb,lintzc/gpdb,Quikling/gpdb,yuanzhao/gpdb,edespino/gpdb,lisakowen/gpdb,kmjungersen/PostgresXL,snaga/postgres-xl,atris/gpdb,rvs/gpdb,lpetrov-pivotal/gpdb,kaknikhil/gpdb,zaksoup/gpdb,foyzur/gpdb,ashwinstar/gpdb,ahachete/gpdb,50wu/gpdb,arcivanov/postgres-xl,Quikling/gpdb,zeroae/postgres-xl,Quikling/gpdb,atris/gpdb,zeroae/postgres-xl,CraigHarris/gpdb,Chibin/gpdb,yuanzhao/gpdb,Postgres-XL/Postgres-XL,lisakowen/gpdb,lpetrov-pivotal/gpdb,yazun/postgres-xl,snaga/postgres-xl,tpostgres-projects/tPostgres,0x0FFF/gpdb,snaga/postgres-xl,atris/gpdb,Postgres-XL/Postgres-XL,foyzur/gpdb,lpetrov-pivotal/gpdb,Chibin/gpdb,greenplum-db/gpdb,chrishajas/gpdb,postmind-net/postgres-xl,kmjungersen/PostgresXL,foyzur/gpdb,lisakowen/gpdb,atris/gpdb,kaknikhil/gpdb,janebeckman/gpdb,royc1/gpdb,adam8157/gpdb,adam8157/gpdb,snaga/postgres-xl,lintzc/gpdb,ashwinstar/gpdb,xuegang/gpdb,Postgres-XL/Postgres-XL,Chibin/gpdb,50wu/gpdb,cjcjameson/gpdb,CraigHarris/gpdb,50wu/gpdb,rubikloud/gpdb,atris/gpdb,pavanvd/postgres-xl,greenplum-db/gpdb,snaga/postgres-xl,CraigHarris/gpdb,xuegang/gpdb,yazun/postgres-xl,rvs/gpdb,atris/gpdb,yuanzhao/gpdb,arcivanov/postgres-xl,Quikling/gpdb,greenplum-db/gpdb,lintzc/gpdb,CraigHarris/gpdb,jmcatamney/gpdb,rvs/gpdb,50wu/gpdb,pavanvd/postgres-xl,ashwinstar/gpdb,CraigHarris/gpdb,xuegang/gpdb,kaknikhil/gpdb,atris/gpdb,tangp3/gpdb,yuanzhao/gpdb,adam8157/gpdb,arcivanov/postgres-xl,tpostgres-projects/tPostgres,xinzweb/gpdb,ovr/postgres-xl,yazun/postgres-xl,xinzweb/gpdb,xinzweb/gpdb,rubikloud/gpdb,zaksoup/gpdb,cjcjameson/gpdb,zaksoup/gpdb,chrishajas/gpdb,adam8157/gpdb,cjcjameson/gpdb,ahachete/gpdb,tangp3/gpdb,xuegang/gpdb,0x0FFF/gpdb,edespino/gpdb,chrishajas/gpdb,chrishajas/gpdb,postmind-net/postgres-xl,ashwinstar/gpdb,edespino/gpdb,rvs/gpdb,adam8157/gpdb,jmcatamney/gpdb,oberstet/postgres-xl,zaksoup/gpdb,chrishajas/gpdb,randomtask1155/gpdb,jmcatamney/gpdb,royc1/gpdb,xinzweb/gpdb,rubikloud/gpdb,kaknikhil/gpdb,pavanvd/postgres-xl,oberstet/postgres-xl,xuegang/gpdb,adam8157/gpdb,greenplum-db/gpdb,0x0FFF/gpdb,lpetrov-pivotal/gpdb,rvs/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,lisakowen/gpdb,oberstet/postgres-xl,rvs/gpdb,xuegang/gpdb,chrishajas/gpdb,yuanzhao/gpdb,foyzur/gpdb,kaknikhil/gpdb,Chibin/gpdb,chrishajas/gpdb,xinzweb/gpdb,greenplum-db/gpdb,randomtask1155/gpdb,ahachete/gpdb,tangp3/gpdb,Quikling/gpdb,janebeckman/gpdb,zaksoup/gpdb,arcivanov/postgres-xl,edespino/gpdb,tangp3/gpdb,xinzweb/gpdb,rubikloud/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,techdragon/Postgres-XL,royc1/gpdb,techdragon/Postgres-XL,edespino/gpdb,ahachete/gpdb,CraigHarris/gpdb,tangp3/gpdb,xuegang/gpdb,xinzweb/gpdb,edespino/gpdb,lintzc/gpdb,ashwinstar/gpdb,zeroae/postgres-xl,royc1/gpdb,xinzweb/gpdb,oberstet/postgres-xl,kaknikhil/gpdb,kmjungersen/PostgresXL,edespino/gpdb,rvs/gpdb,0x0FFF/gpdb,ashwinstar/gpdb,lpetrov-pivotal/gpdb,kmjungersen/PostgresXL,royc1/gpdb,cjcjameson/gpdb,tpostgres-projects/tPostgres,lisakowen/gpdb,lisakowen/gpdb,kaknikhil/gpdb,Quikling/gpdb,foyzur/gpdb,cjcjameson/gpdb,lpetrov-pivotal/gpdb,rvs/gpdb,greenplum-db/gpdb,Chibin/gpdb,rubikloud/gpdb,ahachete/gpdb,janebeckman/gpdb,yazun/postgres-xl,0x0FFF/gpdb,janebeckman/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,lpetrov-pivotal/gpdb,lintzc/gpdb,lisakowen/gpdb,atris/gpdb,postmind-net/postgres-xl,foyzur/gpdb,yazun/postgres-xl,pavanvd/postgres-xl,Chibin/gpdb,jmcatamney/gpdb,techdragon/Postgres-XL,foyzur/gpdb,techdragon/Postgres-XL,tangp3/gpdb,ovr/postgres-xl,ovr/postgres-xl,rvs/gpdb,cjcjameson/gpdb,Quikling/gpdb,royc1/gpdb,tangp3/gpdb,0x0FFF/gpdb,lpetrov-pivotal/gpdb,randomtask1155/gpdb,Quikling/gpdb,0x0FFF/gpdb,zeroae/postgres-xl,chrishajas/gpdb,yuanzhao/gpdb,Postgres-XL/Postgres-XL,kaknikhil/gpdb,50wu/gpdb,CraigHarris/gpdb,xuegang/gpdb,randomtask1155/gpdb,randomtask1155/gpdb,Chibin/gpdb,tpostgres-projects/tPostgres,lintzc/gpdb,kaknikhil/gpdb,zaksoup/gpdb,50wu/gpdb,techdragon/Postgres-XL