Delete vendored code and update CI to Go 1.13 (#158)

As the Go community transitions to using the modules ecosystem,
we want to only support one way of managing dependencies.
So this change moves to only using Go modules for dependency management.

This means that our effective minimum Go version increases to Go 1.11.
To account for this, we also update:
  - the documentation
  - Makefile
  - CI scripts

1 files changed, 0 insertions, 50 deletions

diff --git a/vendor/golang.org/x/sys/unix/mksysnum_openbsd.pl b/vendor/golang.org/x/sys/unix/mksysnum_openbsd.pl
deleted file mode 100644
index 84edf60..0000000
--- a/vendor/golang.org/x/sys/unix/mksysnum_openbsd.pl
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/usr/bin/env perl
-# Copyright 2009 The Go Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
-#
-# Generate system call table for OpenBSD from master list
-# (for example, /usr/src/sys/kern/syscalls.master).
-
-use strict;
-
-if($ENV{'GOARCH'} eq "" || $ENV{'GOOS'} eq "") {
-	print STDERR "GOARCH or GOOS not defined in environment\n";
-	exit 1;
-}
-
-my $command = "mksysnum_openbsd.pl " . join(' ', @ARGV);
-
-print <<EOF;
-// $command
-// Code generated by the command above; see README.md. DO NOT EDIT.
-
-// +build $ENV{'GOARCH'},$ENV{'GOOS'}
-
-package unix
-
-const (
-EOF
-
-while(<>){
-	if(/^([0-9]+)\s+STD\s+(NOLOCK\s+)?({ \S+\s+\*?(\w+).*)$/){
-		my $num = $1;
-		my $proto = $3;
-		my $name = $4;
-		$name =~ y/a-z/A-Z/;
-
-		# There are multiple entries for enosys and nosys, so comment them out.
-		if($name =~ /^SYS_E?NOSYS$/){
-			$name = "// $name";
-		}
-		if($name eq 'SYS_SYS_EXIT'){
-			$name = 'SYS_EXIT';
-		}
-
-		print "	$name = $num;  // $proto\n";
-	}
-}
-
-print <<EOF;
-)
-EOF