Require rainbow gem version to be 2.1.x due to ku1ik/rainbow#40 (#516)

exercism · Dec 28, 2016 · 11ac0bb · 11ac0bb
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commit 11ac0bb
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diff --git a/Gemfile b/Gemfile
@@ -1,6 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'minitest'
+gem 'rainbow', '>= 2.1.0', '< 2.2.0'
 gem 'rubocop', '0.36.0'
 gem 'simplecov'
 gem 'rake'