Bump to v4.0.0.

internal/copyObject.js

@@ -0,0 +1,16 @@
+import copyObjectWith from './copyObjectWith';
+
+/**
+ * Copies properties of `source` to `object`.
+ *
+ * @private
+ * @param {Object} source The object to copy properties from.
+ * @param {Array} props The property names to copy.
+ * @param {Object} [object={}] The object to copy properties to.
+ * @returns {Object} Returns `object`.
+ */
+function copyObject(source, props, object) {
+  return copyObjectWith(source, props, object);
+}
+
+export default copyObject;