feat: removes "isValidatable" from public API

BREAKING CHANGE: Gavel no longer exposes "isValidatable" method in its public API

Author: artem-zakharchenko

lib/gavel.js

@@ -1,6 +1,7 @@
 const { HttpRequest, ExpectedHttpRequest } = require('./model/http-request');
 const { HttpResponse, ExpectedHttpResponse } = require('./model/http-response');
-const { isValid, isValidatable } = require('./validate');
+const { isValid } = require('./validate');
+
 const validate = require('./next/validate');
 
 module.exports = {
@@ -12,6 +13,5 @@ module.exports = {
   HttpResponse,
   ExpectedHttpRequest,
   ExpectedHttpResponse,
-  isValid,
-  isValidatable
+  isValid
 };

lib/validate.js

@@ -52,11 +52,6 @@ const { isValid } = result;\
   return proxy(getValidatableObject(real, expected, type), 'isValid', cb);
 }
 
-function isValidatable(real, expected, type, cb) {
-  return proxy(getValidatableObject(real, expected, type), 'isValidatable', cb);
-}
-
 module.exports = {
-  isValid,
-  isValidatable
+  isValid
 };