pdd.gemspec in pdd-0.22.0 vs pdd.gemspec in pdd-0.23.0

@@ -27,10 +27,10 @@
 Gem::Specification.new do |s|
   if s.respond_to? :required_rubygems_version=
     s.required_rubygems_version =
       Gem::Requirement.new('>= 0')
   end
-  s.required_ruby_version = '~> 2.3'
+  s.required_ruby_version = '~>2'
   s.name = 'pdd'
   s.version = PDD::VERSION
   s.license = 'MIT'
   s.summary = 'Puzzle Driven Development collector'
   s.description = 'Collects PDD puzzles from a source code base'