Fix #239

Fixes #239

openpgp/clearsign/clearsign.go

@@ -359,7 +359,7 @@ func (d *dashEscaper) Close() (err error) {
 
 // Encode returns a WriteCloser which will clear-sign a message with privateKey
 // and write it to w. If config is nil, sensible defaults are used.
-func Encode(w io.Writer, privateKey *packet.PrivateKey, config *packet.Config, headers map[string]string) (plaintext io.WriteCloser, err error) {
+func Encode(w io.Writer, privateKey *packet.PrivateKey, config *packet.Config) (plaintext io.WriteCloser, err error) {
 	return EncodeMulti(w, []*packet.PrivateKey{privateKey}, config)
 }