Rakefile in earthquake-0.4.6 vs Rakefile in earthquake-0.4.7

@@ -35,9 +35,10 @@
 2) Launch earthquake:
 
     $ earthquake
 
 }
+  gem.required_ruby_version = Gem::Requirement.new(">= 1.9.1")
 end
 Jeweler::RubygemsDotOrgTasks.new
 
 require 'rspec/core'
 require 'rspec/core/rake_task'