chore: allow v4 tests to run without env var for contributors

src/pact.integration.spec.ts

@@ -4,6 +4,10 @@ import chaiAsPromised from 'chai-as-promised';
 import sinonChai from 'sinon-chai';
 import axios from 'axios';
 import net = require('net');
+
+process.env.ENABLE_FEATURE_V4 = 'true';
+
+// eslint-disable-next-line import/first
 import { PactV4 } from './v4';
 
 const { expect } = chai;