require logger in test helper

Author: rosston

test/test_helper.rb

@@ -1,6 +1,9 @@
 $LOAD_PATH.unshift File.expand_path("../../lib", __FILE__)
 require "good_migrations"
 
+# Fix concurrent-ruby removing logger dependency which Rails was transitively
+# depending on.
+require "logger"
 require "minitest/autorun"
 require "open3"
 require "pry"