Fix activesupport dependency

delayed_job.gemspec

@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |s|
   s.name              = 'delayed_job'
-  s.version           = '2.1.0.pre'
+  s.version           = '2.1.0.pre2'
   s.authors           = ["Brandon Keepers", "Tobias L\303\274tke"]
   s.summary           = 'Database-backed asynchronous priority queue system -- Extracted from Shopify'
   s.description       = "Delayed_job (or DJ) encapsulates the common pattern of asynchronously executing longer tasks in the background. It is a direct extraction from Shopify where the job table is responsible for a multitude of core tasks.
@@ -18,7 +18,7 @@ This gem is collectiveidea's fork (http://github.com/collectiveidea/delayed_job)
   s.test_files        = Dir.glob('spec/**/*')
 
   s.add_runtime_dependency      'daemons'
-  s.add_runtime_dependency      'activesupport' '~>3'
+  s.add_runtime_dependency      'activesupport', '~>3.0'
   s.add_development_dependency  'rspec'
   s.add_development_dependency  'sqlite3-ruby'
   s.add_development_dependency  'activerecord'