doggy.gemspec in doggy-2.0.15 vs doggy.gemspec in doggy-2.0.17

@@ -17,10 +17,10 @@
   spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = '~> 2.1'
+  spec.required_ruby_version = '~> 2.0'
 
   spec.add_dependency "json",     "~> 1.8.3"
   spec.add_dependency "parallel", "~> 1.6.1"
   spec.add_dependency "thor",     "~> 0.19.1"
   spec.add_dependency "virtus",   "~> 1.0.5"