gemspec: declare Ruby 2.0+ dependency, here

We've been 2.0+ for a few years, actually.

1 files changed, 3 insertions, 0 deletions

diff --git a/yahns.gemspec b/yahns.gemspec
index 31eb957..b4af5b5 100644
--- a/yahns.gemspec
+++ b/yahns.gemspec
@@ -10,6 +10,9 @@ Gem::Specification.new do |s|
   s.email = %q{yahns-public@yhbt.net}
   s.executables = manifest.grep(%r{\Abin/}).map { |s| s.sub(%r{\Abin/}, "") }
   s.files = manifest
+
+  s.required_ruby_version = '>= 2.0'
+
   s.add_dependency(%q<kgio>, '~> 2.9')
   s.add_dependency(%q<sleepy_penguin>, '~> 3.2')
   s.add_dependency(%q<unicorn>, '>= 4.6.3', '< 6.0')