Bump to v4.7.0.

unionWith.js

@@ -10,6 +10,7 @@ define(['./_baseFlatten', './_baseUniq', './isArrayLikeObject', './last', './res
    *
    * @static
    * @memberOf _
+   * @since 4.0.0
    * @category Array
    * @param {...Array} [arrays] The arrays to inspect.
    * @param {Function} [comparator] The comparator invoked per element.