Update collection copyright year

doc/sphinx/index.rst

@@ -37,7 +37,7 @@ Longer listings like example command output and VCL look like this::
     $ /opt/varnish/sbin/varnishd -V
     varnishd (varnish-trunk revision 199de9b)
     Copyright (c) 2006 Verdens Gang AS
-    Copyright (c) 2006-2015 Varnish Software AS
+    Copyright (c) 2006-2018 Varnish Software AS
 
 
 .. For maintainers:

lib/libvarnish/version.c

@@ -44,5 +44,5 @@ VCS_Message(const char *progname)
 {
 	fprintf(stderr, "%s (%s)\n", progname, VCS_version);
 	fprintf(stderr, "Copyright (c) 2006 Verdens Gang AS\n");
-	fprintf(stderr, "Copyright (c) 2006-2015 Varnish Software AS\n");
+	fprintf(stderr, "Copyright (c) 2006-2018 Varnish Software AS\n");
 }