Update libpgeasy readme.

Author: bmomjian

src/interfaces/libpgeasy/README

@@ -4,7 +4,7 @@
 		    (Formerly contrib/pginterface)
 
 Attached is a copy of the Postgres support routines I wrote to allow me
-to more cleanly interface to the libpg library, more like a 4gl SQL
+to more cleanly interface to the libpq library, more like a 4gl SQL
 interface.
 
 Bruce Momjian (root@candle.pha.pa.us)