Update future-tense comments in README to present tense.  Noted by Neil Conway.
Update future-tense comments in README to present tense.  Noted by
Neil Conway.

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