Update to 6.18

Upstream changes:
6.18      2018-06-05 16:29:15Z
    - Revert status_message to original code (GH#111) (Theo van Hoesel)

6.17      2018-06-05 01:55:34Z
    - Documented status code 451 in the list of constants (GH #104) (Robert Rothenberg)
    - Status code 451 is cachable by default, as per RFC 7725 (GH #104) (Robert Rothenberg)
    - Add default status_message for unknown status codes (GH#105) (Robert Rothenberg)
    - Corrections to the documentation (GH#102) (Jonas B. Nielsen)

www/p5-HTTP-Message/Makefile

@@ -1,6 +1,6 @@
-# $NetBSD: Makefile,v 1.20 2018/05/02 14:08:10 wiz Exp $
+# $NetBSD: Makefile,v 1.21 2018/06/06 07:45:31 wen Exp $
 
-DISTNAME=	HTTP-Message-6.16
+DISTNAME=	HTTP-Message-6.18
 PKGNAME=	p5-${DISTNAME}
 CATEGORIES=	www perl5
 MASTER_SITES=	${MASTER_SITE_PERL_CPAN:=HTTP/}

www/p5-HTTP-Message/distinfo

@@ -1,6 +1,6 @@
-$NetBSD: distinfo,v 1.11 2018/05/02 14:08:10 wiz Exp $
+$NetBSD: distinfo,v 1.12 2018/06/06 07:45:31 wen Exp $
 
-SHA1 (HTTP-Message-6.16.tar.gz) = 42ee440456170b748a4c9b701fcfcdb5e949629b
-RMD160 (HTTP-Message-6.16.tar.gz) = dc5cfd6e117b4975f9bcceec7b21eb618660ea8d
-SHA512 (HTTP-Message-6.16.tar.gz) = 9dae693623fa81a0d62ec66fa59b71f5cdbdae6b3146617632b4de0dfa2bbe9eb0a51cf0e98e1ababd85aad97510b469da64ec2254d09bb89461412099344128
-Size (HTTP-Message-6.16.tar.gz) = 79196 bytes
+SHA1 (HTTP-Message-6.18.tar.gz) = 812926834f4386c462ced4aab44f0fdf7affdbbc
+RMD160 (HTTP-Message-6.18.tar.gz) = 2c6fdbcaffa37785e912f60cac96ffa31cbf9588
+SHA512 (HTTP-Message-6.18.tar.gz) = 46a5d4ee6af1bdb7b320ae8ad430b4dbff9a198a60d025703fa64a83284dfe6bee08041fc43372b6ea724ab973f84c3cbca5353d6158bdfbbed612577de61206
+Size (HTTP-Message-6.18.tar.gz) = 81363 bytes