Merge pull request #1821 from troessner/tighten-rainbow-dependency

Require Rainbow 3.x

Author: mvz

reek.gemspec

@@ -37,6 +37,6 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'dry-schema', '~> 1.13'
   spec.add_dependency 'logger',  '~> 1.6'
   spec.add_dependency 'parser',  '~> 3.3.0'
-  spec.add_dependency 'rainbow', '>= 2.0', '< 4.0'
+  spec.add_dependency 'rainbow', '~> 3.0'
   spec.add_dependency 'rexml',   '~> 3.1'
 end