trezor plugin: add paytowitness (not supported yet)

plugins/trezor/plugin.py

@@ -6,7 +6,7 @@ from binascii import hexlify, unhexlify
 from functools import partial
 
 from electrum.util import bfh, bh2u
-from electrum.bitcoin import (b58_address_to_hash160, xpub_from_pubkey,
+from electrum.bitcoin import (is_segwit_address, b58_address_to_hash160, xpub_from_pubkey,
                               public_key_to_p2pkh, EncodeBase58Check,
                               TYPE_ADDRESS, TYPE_SCRIPT,
                               TESTNET, ADDRTYPE_P2PKH, ADDRTYPE_P2SH)
@@ -365,6 +365,9 @@ class TrezorCompatiblePlugin(HW_PluginBase):
                     txoutputtype.script_type = self.types.PAYTOOPRETURN
                     txoutputtype.op_return_data = address[2:]
                 elif _type == TYPE_ADDRESS:
+                    if is_segwit_address(address):
+                        txoutputtype.script_type = self.types.PAYTOWITNESS
+                    else:
                         addrtype, hash_160 = b58_address_to_hash160(address)
                         if addrtype == ADDRTYPE_P2PKH:
                             txoutputtype.script_type = self.types.PAYTOADDRESS