rails app not connecting to redis on heroku (RedisToGo) - ruby-on-rails

Question

am trying to push my rails 4 app on heroku but getting this error:
Error connecting to Redis on 127.0.0.1:6379 (ECONNREFUSED) (Redis::CannotConnectError)
on heroku logs, i have completed the RedisToGo setup as suggested by the heroku devcenter
but nothing happened i think am doing something wrong with RedisToGo URL
redis.rb
uri = URI.parse(ENV["REDIS_URL"] || "redis://redistogo:0deb5da103a95090a365444d016c59a6#angelfish.redistogo.com:9308/" )
$redis = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password)
my development.rb
Rails.application.configure do
# Settings specified here will take precedence over those in config/application.rb.
# In the development environment your application's code is reloaded on
# every request. This slows down response time but is perfect for development
# since you don't have to restart the web server when you make code changes.
config.cache_classes = false
# Do not eager load code on boot.
config.eager_load = false
# Show full error reports and disable caching.
config.consider_all_requests_local = true
config.action_controller.perform_caching = false
# Action Mailer configuration
config.action_mailer.raise_delivery_errors = true
config.action_mailer.delivery_method = :test
config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
# Print deprecation notices to the Rails logger.
config.active_support.deprecation = :log
# Raise an error on page load if there are pending migrations.
config.active_record.migration_error = :page_load
# Debug mode disables concatenation and preprocessing of assets.
# This option may cause significant delays in view rendering with a large
# number of complex assets.
config.assets.debug = true
# Asset digests allow you to set far-future HTTP expiration dates on all assets,
# yet still be able to expire them through the digest params.
config.assets.digest = true
# Adds additional error checking when serving assets at runtime.
# Checks for improperly declared sprockets dependencies.
# Raises helpful error messages.
config.assets.raise_runtime_errors = true
ENV["REDISTOGO_URL"] = 'redis://redistogo:0deb5da103a95090a365444d016c59a6#angelfish.redistogo.com:9308/'
# Raises error for missing translations
# config.action_view.raise_on_missing_translations = true
# React configurations.
config.react.variant = :development
config.react.addons = true
config.after_initialize do
Bullet.enable = true
Bullet.alert = true
end
end