Fix gemspec

Author: mattvague

activeadmin.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency("rails", ">= 3.0.0")
   s.add_dependency("jquery-rails", ">= 1.0.0")
-  s.add_dependency("bourbon", "~> 1.0.0")
+  s.add_dependency("bourbon", ">= 1.0.0")
   s.add_dependency("meta_search", ">= 0.9.2")
   s.add_dependency("devise", ">= 1.1.2")
   s.add_dependency("formtastic", ">= 2.0.0")