organize simplecov

.simplecov

+# .simplecov
+SimpleCov.start 'rails' do
+  merge_timeout 3600
+end

features/support/env.rb

-unless ENV['CI']
-  require 'simplecov'
-  SimpleCov.start 'rails'
-end
+require 'simplecov' unless ENV['CI']
 ENV['RAILS_ENV'] = 'test'
 require './config/environment'

spec/spec_helper.rb

-unless ENV['CI']
-  require 'simplecov'
-  SimpleCov.start 'rails'
-end
+require 'simplecov' unless ENV['CI']
 # This file is copied to spec/ when you run 'rails generate rspec:install'
 ENV["RAILS_ENV"] ||= 'test'