pusher: use const instead of var because this is es6 (and eslint said so)
pusher: use const instead of var because this is es6 (and eslint said so)

fotinakis/travis-web,travis-ci/travis-web,travis-ci/travis-web,fotinakis/travis-web,fotinakis/travis-web,travis-ci/travis-web,fotinakis/travis-web,travis-ci/travis-web