Update github.com/xenolf/lego to 0.4.1

vendor/github.com/Azure/go-autorest/autorest/version.go

@@ -1,29 +1,35 @@
 package autorest
 
 import (
+	"bytes"
 	"fmt"
 	"strings"
 	"sync"
 )
 
 const (
-	major = 7
-	minor = 3
-	patch = 1
+	major = 8
+	minor = 0
+	patch = 0
 	tag   = ""
 )
 
-var versionLock sync.Once
+var once sync.Once
 var version string
 
 // Version returns the semantic version (see http://semver.org).
 func Version() string {
-	versionLock.Do(func() {
-		version = fmt.Sprintf("v%d.%d.%d", major, minor, patch)
-
-		if trimmed := strings.TrimPrefix(tag, "-"); trimmed != "" {
-			version = fmt.Sprintf("%s-%s", version, trimmed)
+	once.Do(func() {
+		semver := fmt.Sprintf("%d.%d.%d", major, minor, patch)
+		verBuilder := bytes.NewBufferString(semver)
+		if tag != "" && tag != "-" {
+			updated := strings.TrimPrefix(tag, "-")
+			_, err := verBuilder.WriteString("-" + updated)
+			if err == nil {
+				verBuilder = bytes.NewBufferString(semver)
+			}
 		}
+		version = verBuilder.String()
 	})
 	return version
 }