Relax Bundler version requirement

Author: tf

activeadmin-searchable_select.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '>= 2.1'
 
-  spec.add_development_dependency 'bundler', ['>= 1.5', '< 3']
+  spec.add_development_dependency 'bundler', '>= 1.5'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'appraisal', '~> 2.2'
   spec.add_development_dependency 'rspec-rails', '~> 3.6'