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, 37 deletions

diff --git a/vendor/golang.org/x/crypto/blake2b/blake2bAVX2_amd64.go b/vendor/golang.org/x/crypto/blake2b/blake2bAVX2_amd64.go
deleted file mode 100644
index 4d31dd0..0000000
--- a/vendor/golang.org/x/crypto/blake2b/blake2bAVX2_amd64.go
+++ /dev/null
@@ -1,37 +0,0 @@
-// Copyright 2016 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.
-
-// +build go1.7,amd64,!gccgo,!appengine
-
-package blake2b
-
-import "golang.org/x/sys/cpu"
-
-func init() {
-	useAVX2 = cpu.X86.HasAVX2
-	useAVX = cpu.X86.HasAVX
-	useSSE4 = cpu.X86.HasSSE41
-}
-
-//go:noescape
-func hashBlocksAVX2(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte)
-
-//go:noescape
-func hashBlocksAVX(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte)
-
-//go:noescape
-func hashBlocksSSE4(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte)
-
-func hashBlocks(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte) {
-	switch {
-	case useAVX2:
-		hashBlocksAVX2(h, c, flag, blocks)
-	case useAVX:
-		hashBlocksAVX(h, c, flag, blocks)
-	case useSSE4:
-		hashBlocksSSE4(h, c, flag, blocks)
-	default:
-		hashBlocksGeneric(h, c, flag, blocks)
-	}
-}