Add node modules and new code for release

node_modules/@jest/core/build/pluralize.js

@@ -0,0 +1,16 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.default = pluralize;
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+function pluralize(word, count, ending) {
+  return `${count} ${word}${count === 1 ? '' : ending}`;
+}