Mail: In PHPMailer 5.2.7 the case of the `Send()` method changed to `send()`, update our call for consistency with the library.

Props michalzuber.
Fixes #39469.

Built from https://develop.svn.wordpress.org/trunk@39691


git-svn-id: http://core.svn.wordpress.org/trunk@39631 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/pluggable.php

@@ -478,7 +478,7 @@ function wp_mail( $to, $subject, $message, $headers = '', $attachments = array()
 
 	// Send!
 	try {
-		return $phpmailer->Send();
+		return $phpmailer->send();
 	} catch ( phpmailerException $e ) {
 
 		$mail_error_data = compact( 'to', 'subject', 'message', 'headers', 'attachments' );

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-39689';
+$wp_version = '4.8-alpha-39691';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.