Update README

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thoughtbot · Feb 3, 2017 · 081e9ee · 081e9ee
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@@ -23,6 +23,8 @@ See the READMEs for these projects for more information.
 ## Overview
 
 ```ruby
+require "test_helper"
+
 class UserTest < ActiveSupport::TestCase
   context "associations" do
     should have_many(:posts)