Update readme.
Update readme.

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