ConsumerVersionSelectors interface does support fallbackBranch (which is defined in document)

[samer-lahlouh]

Expected behaviour
Can set up like this

const verificationOptions = {
  //...
  consumerVersionSelectors: [
    {
      matchingBranch: true,
      fallbackBranch: "main"
    }
  ]
}

Actual behaviour

Steps to reproduce
I checked code base here https://github.com/pact-foundation/pact-js-core/blob/master/src/verifier/types.ts#L3

export interface ConsumerVersionSelector {
  tag?: string;
  latest?: boolean;
  consumer?: string;
  deployedOrReleased?: boolean;
  deployed?: boolean;
  released?: boolean;
  environment?: string;
  fallbackTag?: string;
  branch?: string;
  mainBranch?: boolean;
  matchingBranch?: boolean;
}

It does not match the document https://docs.pact.io/pact_broker/advanced_topics/consumer_version_selectors#properties

[mefellows]

Thanks. You can always force-add properties to that type, but I appreciate that's not nice.

Would you be open to a PR? It should be relatively straightforward to add this support.