Update p2p/conn/secret_connection.go

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

p2p/conn/secret_connection.go

@@ -135,7 +135,7 @@ func MakeSecretConnection(conn io.ReadWriteCloser, locPrivKey crypto.PrivKey) (*
 	remPubKey, remSignature := authSigMsg.Key, authSigMsg.Sig
 
 	if remPubKey == nil {
-		return nil, errors.New("Peer sent a nil public key")
+		return nil, errors.New("peer sent a nil public key")
 	}
 
 	if !remPubKey.VerifyBytes(challenge[:], remSignature) {