fix missing bracket
fix missing bracket

fix #940
michabbb-backup/swiftmailer,jamesggordon/swiftmailer,swiftmailer/swiftmailer,Rotzbua/swiftmailer,voku/swiftmailer,gencer/swiftmailer,Rotzbua/swiftmailer,c960657/swiftmailer,voku/swiftmailer,c960657/swiftmailer,gencer/swiftmailer,swiftmailer/swiftmailer,michabbb-backup/swiftmailer,jamesggordon/swiftmailer