Add --compress and --mangle options to uglifyjs step.
Add --compress and --mangle options to uglifyjs step.

Saves a few KB.

honeybadger-io/honeybadger-js,honeybadger-io/honeybadger-js,honeybadger-io/honeybadger-js,honeybadger-io/honeybadger-js,honeybadger-io/honeybadger-js,honeybadger-io/honeybadger-js