Update release notes to say citext is multi-byte aware, per suggestion from patch author:
Update release notes to say citext is multi-byte aware, per suggestion
from patch author:

       Add /contrib/citext as a case-insensitive, multibyte-capable
	text data type (David Wheeler)

postmind-net/postgres-xl,lisakowen/gpdb,adam8157/gpdb,Chibin/gpdb,50wu/gpdb,edespino/gpdb,yuanzhao/gpdb,lisakowen/gpdb,xinzweb/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,zeroae/postgres-xl,arcivanov/postgres-xl,Chibin/gpdb,ovr/postgres-xl,oberstet/postgres-xl,techdragon/Postgres-XL,lisakowen/gpdb,yazun/postgres-xl,zeroae/postgres-xl,jmcatamney/gpdb,lisakowen/gpdb,tpostgres-projects/tPostgres,greenplum-db/gpdb,50wu/gpdb,lisakowen/gpdb,edespino/gpdb,xinzweb/gpdb,ashwinstar/gpdb,edespino/gpdb,50wu/gpdb,edespino/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,kmjungersen/PostgresXL,tpostgres-projects/tPostgres,jmcatamney/gpdb,xinzweb/gpdb,xinzweb/gpdb,adam8157/gpdb,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,Chibin/gpdb,xinzweb/gpdb,snaga/postgres-xl,pavanvd/postgres-xl,postmind-net/postgres-xl,Postgres-XL/Postgres-XL,snaga/postgres-xl,zeroae/postgres-xl,yuanzhao/gpdb,ovr/postgres-xl,kmjungersen/PostgresXL,50wu/gpdb,kmjungersen/PostgresXL,ovr/postgres-xl,adam8157/gpdb,kmjungersen/PostgresXL,50wu/gpdb,Chibin/gpdb,yuanzhao/gpdb,tpostgres-projects/tPostgres,yuanzhao/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,arcivanov/postgres-xl,oberstet/postgres-xl,oberstet/postgres-xl,yuanzhao/gpdb,ovr/postgres-xl,adam8157/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,oberstet/postgres-xl,xinzweb/gpdb,edespino/gpdb,adam8157/gpdb,edespino/gpdb,yuanzhao/gpdb,yuanzhao/gpdb,50wu/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,xinzweb/gpdb,snaga/postgres-xl,arcivanov/postgres-xl,pavanvd/postgres-xl,lisakowen/gpdb,xinzweb/gpdb,edespino/gpdb,oberstet/postgres-xl,Chibin/gpdb,Chibin/gpdb,greenplum-db/gpdb,pavanvd/postgres-xl,yuanzhao/gpdb,Chibin/gpdb,yazun/postgres-xl,50wu/gpdb,techdragon/Postgres-XL,kmjungersen/PostgresXL,lisakowen/gpdb,postmind-net/postgres-xl,greenplum-db/gpdb,yazun/postgres-xl,edespino/gpdb,zeroae/postgres-xl,edespino/gpdb,adam8157/gpdb,ashwinstar/gpdb,postmind-net/postgres-xl,50wu/gpdb,ovr/postgres-xl,greenplum-db/gpdb,snaga/postgres-xl,techdragon/Postgres-XL,tpostgres-projects/tPostgres,adam8157/gpdb,arcivanov/postgres-xl,Chibin/gpdb,techdragon/Postgres-XL,edespino/gpdb,tpostgres-projects/tPostgres,greenplum-db/gpdb,zeroae/postgres-xl,greenplum-db/gpdb,jmcatamney/gpdb,snaga/postgres-xl,yazun/postgres-xl,lisakowen/gpdb,ashwinstar/gpdb,techdragon/Postgres-XL,yuanzhao/gpdb,yazun/postgres-xl,ashwinstar/gpdb,Chibin/gpdb,Postgres-XL/Postgres-XL,Postgres-XL/Postgres-XL,postmind-net/postgres-xl,greenplum-db/gpdb,yuanzhao/gpdb,Chibin/gpdb,arcivanov/postgres-xl,adam8157/gpdb