Duplicating changes made to master to the V6 branch

Author: JacksonDMiller

src/transaction.d.ts

@@ -1,4 +1,3 @@
-/// <reference types="node" />
 export interface Output {
     script: Buffer;
     value: number;
@@ -35,6 +34,7 @@ export declare class Transaction {
     addInput(hash: Buffer, index: number, sequence?: number, scriptSig?: Buffer): number;
     addOutput(scriptPubKey: Buffer, value: number): number;
     hasWitnesses(): boolean;
+    stripWitnesses(): void;
     weight(): number;
     virtualSize(): number;
     byteLength(_ALLOW_WITNESS?: boolean): number;