accent-buster.gemspec in accent-buster-0.9.0 vs accent-buster.gemspec in accent-buster-1.0.0

@@ -2,9 +2,12 @@
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'accent-buster/version'
 
 Gem::Specification.new do |spec|
+  # We are using refinements
+  spec.required_ruby_version = '>= 2.0'
+
   spec.name          = "accent-buster"
   spec.version       = AccentBuster::VERSION
   spec.authors       = ["Ronie Uliana"]
   spec.email         = ["[e-mail]"]
   spec.description   = %q{Add "String#accent_buster" that replaces diacritics marks by their non-diacritic equivalents.}