Bump AA dep up to anything under 3

Author: boie0025

activeadmin-mongoid.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = '>= 2.4'
 
   gem.add_runtime_dependency 'mongoid',     '>= 6.0', '< 8.a'
-  gem.add_runtime_dependency 'activeadmin', '>= 1.3.0', '<= 2.6.0'
+  gem.add_runtime_dependency 'activeadmin', '>= 1.3.0', '<= 3.0.0'
   gem.add_runtime_dependency 'kaminari-mongoid'
   gem.add_runtime_dependency 'jquery-rails'
   gem.add_runtime_dependency 'sass-rails', ['>= 3.1.4']