reduce requirements to allow rails 3 (jamis#31)

Author: TheRusskiy

bulk_insert.gemspec

@@ -17,8 +17,8 @@ Gem::Specification.new do |s|
   s.files = Dir["{app,config,db,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
   s.test_files = Dir["test/**/*"]
 
-  s.add_dependency "activerecord", ">= 4.1.0"
+  s.add_dependency "activerecord", ">= 3.2.0"
 
   s.add_development_dependency "sqlite3"
-  s.add_development_dependency "rails", ">= 4.2.0"
+  s.add_development_dependency "rails", ">= 3.2.0"
 end