WebhookOptions interface's properties made optional

[khalilchoudhry]

Hello,
In the docs, it says to secure Express app by validating incoming Twilio requests with validate property and has used validate property only. The twilio.Webhook() method does not accept validate property alone and gives an error. While if you check it's Javascript code, you can clearly know that all properties are optional and validate is by default true.

Code:

const shouldValidate = process.env.NODE_ENV !== 'test';

app.all('/entrypoint', twilio.webhook({ validate: shouldValidate }), (request, response) => {});

Error:

Argument of type '{ validate: boolean; }' is not assignable to parameter of type 'WebhookOptions'.

Type '{ validate: boolean; }' is missing the following properties from type 'WebhookOptions': includeHelpers, host, protocol

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[khalilchoudhry]

@jingming
@kwhinnery
@childish-sambino
Can someone please review this.

[childish-sambino]

LGTM