fix: acme errors management.

vendor/github.com/xenolf/lego/acmev2/error.go

@@ -1,6 +1,7 @@
 package acmev2
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -13,6 +14,18 @@ const (
 	invalidNonceError = "urn:ietf:params:acme:error:badNonce"
 )
 
+// ObtainError is returned when there are specific errors available
+// per domain. For example in ObtainCertificate
+type ObtainError map[string]error
+
+func (e ObtainError) Error() string {
+	buffer := bytes.NewBufferString("acme: Error -> One or more domains had a problem:\n")
+	for dom, err := range e {
+		buffer.WriteString(fmt.Sprintf("[%s] %s\n", dom, err))
+	}
+	return buffer.String()
+}
+
 // RemoteError is the base type for all errors specific to the ACME protocol.
 type RemoteError struct {
 	StatusCode int    `json:"status,omitempty"`