message: Add analytics to premium upgrade
diff: @@ -2,6 +2,7 @@ Promise = require 'bluebird-q'
  Backbone = require 'backbone'
  { extend } = require 'underscore'
  { STRIPE_PUBLISHABLE_KEY } = require('sharify').data
  +analytics = require '../../../../lib/analytics.coffee'
  styles = require './lib/styles.coffee'
  template = -> require('./index.jade') arguments...
  @@ -125,6 +126,9 @@ module.exports = class PaymentMethodsView extends Backbone.View
  subscription.save()
  + analytics.track.submit 'User paid for pro account',
  + plan_id: @model.get('plan_id')
  +
  .then =>
  Promise($.get('/me/refresh'))
  