greenkeeperio-bot: uglify-js@2.7.5 untested ⚠️

[kzc]

Because of the npm@4.0.2 travis-CI issue in #1384 greenkeeperio-bot reports a warning with uglify-js@2.7.5:

cyclejs-community/cyclic-router#173

Should there be a 2.7.6 release sooner rather than later?

/cc @rvanvelzen