chore: register tbtc4

Ticket: BTC-1606

TICKET: BTC-1606

Author: lcovar

modules/sdk-coin-btc/src/register.ts

@@ -1,6 +1,7 @@
 import { BitGoBase } from '@bitgo/sdk-core';
 import { Btc } from './btc';
 import { Tbtc } from './tbtc';
+import { Tbtc4 } from './tbtc4';
 import { Tbtcsig } from './tbtcsig';
 import { Tbtcbgsig } from './tbtcbgsig';
 
@@ -9,4 +10,5 @@ export const register = (sdk: BitGoBase): void => {
   sdk.register('tbtc', Tbtc.createInstance);
   sdk.register('tbtcsig', Tbtcsig.createInstance);
   sdk.register('tbtcbgsig', Tbtcbgsig.createInstance);
+  sdk.register('tbtc4', Tbtc4.createInstance);
 };