update plugins/backscatterer.js with es6 literals (#2261)
update plugins/backscatterer.js with es6 literals (#2261)


smfreegard/Haraka,haraka/Haraka,msimerson/Haraka,haraka/Haraka,haraka/Haraka,msimerson/Haraka,smfreegard/Haraka,haraka/Haraka,smfreegard/Haraka,smfreegard/Haraka,msimerson/Haraka,msimerson/Haraka