Mention libpq.rc.in is now the file to update for releases.

Author: bmomjian

src/tools/RELEASE_CHANGES

@@ -8,7 +8,7 @@
 	o doc/bug.template
 	o bump interface version numbers
 		- src/interfaces/*/Makefile (major releases only)
-		- src/interfaces/libpq/libpq.rc (major and minor releases)
+		- src/interfaces/libpq/libpq.rc.in (major and minor releases)
 		- src/include/pg_config.h.win32 (major and minor releases)
 		- port/win32ver.rc (major and minor releases)