Update dependencies

Author: zorab47

active_admin-sortable_tree.gemspec

@@ -16,9 +16,10 @@ Gem::Specification.new do |s|
 
   s.files       = `git ls-files app lib vendor`.split($\) + ["Changelog.md", "README.md", "MIT-LICENSE"]
 
-  s.add_dependency 'rails',           '>= 3.2'
-  s.add_dependency 'activeadmin',     '>= 0.6', "< 1.1.0"
-  s.add_dependency 'jquery-ui-rails', '>= 5.0'
+  s.add_dependency 'activeadmin', '>= 1.1'
+  s.add_dependency 'coffee-rails'
+  s.add_dependency 'jquery-rails'
+  s.add_dependency 'sass',        '~> 3.1'
 
   s.add_development_dependency 'capybara'
   s.add_development_dependency 'rspec-rails'