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

code from pantheon

* code from pantheon

wp/wp-content/plugins/wp-mail-smtp/src/Upgrade.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace WPMailSMTP;
+
+/**
+ * Class Upgrade helps upgrade plugin options and similar tasks when the
+ * occasion arises.
+ *
+ * @since 1.1.0
+ */
+class Upgrade {
+
+	/**
+	 * Upgrade constructor.
+	 *
+	 * @since 1.1.0
+	 */
+	public function __construct() {
+
+		$upgrades = $this->upgrades();
+
+		if ( empty( $upgrades ) ) {
+			return;
+		}
+
+		// Run any available upgrades.
+		foreach ( $upgrades as $upgrade ) {
+			$this->{$upgrade}();
+		}
+
+		// Update version post upgrade(s).
+		update_option( 'wp_mail_smtp_version', WPMS_PLUGIN_VER );
+	}
+
+	/**
+	 * Whether we need to perform an upgrade.
+	 *
+	 * @since 1.1.0
+	 *
+	 * @return array
+	 */
+	protected function upgrades() {
+
+		$version  = get_option( 'wp_mail_smtp_version' );
+		$upgrades = array();
+
+		// Version 1.1.0 upgrade; prior to this the option was not available.
+		if ( empty( $version ) ) {
+			$upgrades[] = 'v110_upgrade';
+		}
+
+		return $upgrades;
+	}
+
+	/**
+	 * Upgrade routine for v1.1.0.
+	 *
+	 * Set SMTPAutoTLS to true.
+	 *
+	 * @since 1.1.0
+	 */
+	public function v110_upgrade() {
+
+		// Enable SMTPAutoTLS option.
+		$values = [
+			'smtp' => [
+				'autotls' => true,
+			],
+		];
+
+		Options::init()->set( $values, false, false );
+	}
+}