Update activerecord-import dependency

Author: kelso

active_admin_import.gemspec

@@ -15,7 +15,7 @@ Gem::Specification.new do |gem|
  gem.name = 'active_admin_import'
  gem.require_paths = ['lib']
  gem.version = ActiveAdminImport::VERSION
- gem.add_runtime_dependency 'activerecord-import', '~> 0.17.0'
+ gem.add_runtime_dependency 'activerecord-import', '~> 0.25.0'
  gem.add_runtime_dependency 'rchardet', '~> 1.6'
  gem.add_runtime_dependency 'rubyzip', '~> 1.2'
  gem.add_dependency 'activeadmin', '>= 1.0.0.pre2'