Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/src/helpers/wordpress-helper.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Yoast\WP\SEO\Helpers;
+
+// phpcs:disable WordPress.WP.CapitalPDangit.MisspelledClassName -- It is spelled like `Wordpress_Helper` because of Yoast's naming conventions for classes, which would otherwise break dependency injection in some cases.
+
+/**
+ * A helper object for WordPress matters.
+ */
+class Wordpress_Helper {
+
+	/**
+	 * Returns the WordPress version.
+	 *
+	 * @return string The version.
+	 */
+	public function get_wordpress_version() {
+		global $wp_version;
+
+		return $wp_version;
+	}
+}