Update ruby-pg to 0.20.0

== v0.20.0 [2017-03-10] Michael Granger <ged@FaerieMUD.org>

Enhancements:
- Update error codes to PostgreSQL-9.6
- Update Windows binary gems to Ruby-2.4, PostgreSQL 9.6.1 and
  OpenSSL 1.0.2j.
- Add support for RubyInstaller2 to Windows binary gems.

Bugfixes:
- Use secure JSON methods for JSON (de)serialisation. #248
- Fix Result#inspect on a cleared result.
- Fix test case that failed on Ruby-2.4. #255

Documentation fixes:
- Talk about Integer instead of Fixnum.
- Fix method signature of Coder#encode.

databases/ruby-pg/Makefile

@@ -1,8 +1,7 @@
-# $NetBSD: Makefile,v 1.26 2016/11/19 14:38:03 taca Exp $
+# $NetBSD: Makefile,v 1.27 2017/03/11 16:41:27 taca Exp $
 
-DISTNAME=	pg-0.19.0
+DISTNAME=	pg-0.20.0
 PKGNAME=	${RUBY_PKGPREFIX}-${DISTNAME:C/postgres/&ql/}
-PKGREVISION=	1
 CATEGORIES=	databases
 
 MAINTAINER=	pkgsrc-users@NetBSD.org

databases/ruby-pg/distinfo

@@ -1,7 +1,7 @@
-$NetBSD: distinfo,v 1.20 2016/10/09 12:47:27 taca Exp $
+$NetBSD: distinfo,v 1.21 2017/03/11 16:41:27 taca Exp $
 
-SHA1 (pg-0.19.0.gem) = 78f4a210966421db9bdc8ae90c8310fcd791e57e
-RMD160 (pg-0.19.0.gem) = e3a36f8a8ee978479508faee5820d8314d3a8214
-SHA512 (pg-0.19.0.gem) = e72843d9056cad3998959a37a2abf460a047be734e64e6101a5c9067b7a284b94e25ef410e55444e1a60f88184f26982be851fc25a851b3144a8ed041248d9d4
-Size (pg-0.19.0.gem) = 228864 bytes
+SHA1 (pg-0.20.0.gem) = 432330c00b891856256c6af9ce726de08fda74b9
+RMD160 (pg-0.20.0.gem) = 16b84e47506de7c039fdbb9d10a92cff67293f30
+SHA512 (pg-0.20.0.gem) = 8c7ef2e3b0cb43f42b4f96c5995cd9ff8b01a0d0fc1cfd24d1053e27fa6d16f4eb7008fcb5f86445ad000429898df0215f7ee89b4da9500ddc4df04f5f2a10e2
+Size (pg-0.20.0.gem) = 230400 bytes
 SHA1 (patch-ext_extconf.rb) = 161b826521c4e3b5a5c6aaa88dae572e36257b9c