Fix broken tests due to missing Logger (#174)

Author: ehelms

test/dummy/config/boot.rb

@@ -2,4 +2,5 @@
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../../../Gemfile', __FILE__)
 
 require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
+require "logger" # Fix concurrent-ruby removing logger dependency which Rails itself does not have
 $LOAD_PATH.unshift File.expand_path('../../../../lib', __FILE__)