feat: removes HttpRequest, HttpResponse, and Validatable

BREAKING CHANGE: Gavel no longer exports "HttpRequest" and "HttpResponse" classes. Use "validate" instead.

Author: artem-zakharchenko

lib/gavel.js

@@ -1,15 +1,5 @@
-const { HttpRequest, ExpectedHttpRequest } = require('./model/http-request');
-const { HttpResponse, ExpectedHttpResponse } = require('./model/http-response');
-
 const validate = require('./next/validate');
 
 module.exports = {
-  // next
-  validate,
-
-  // legacy
-  HttpRequest,
-  HttpResponse,
-  ExpectedHttpRequest,
-  ExpectedHttpResponse
+  validate
 };