Merge pull request #490 from nicolasleger/specify_required_ruby_version

Specify required Ruby version

Author: sferik

thor.gemspec

@@ -14,6 +14,7 @@ Gem::Specification.new do |spec|
   spec.licenses = %w[MIT]
   spec.name = "thor"
   spec.require_paths = %w[lib]
+  spec.required_ruby_version = '>= 1.8.7'
   spec.required_rubygems_version = ">= 1.3.5"
   spec.summary = spec.description
   spec.version = Thor::VERSION