Add appraisal for Active Admin 1.1

Author: tf

.travis.yml

@@ -11,5 +11,6 @@ cache:
 gemfile:
   - gemfiles/rails_4.2_active_admin_1.0.0.pre4.gemfile
   - gemfiles/rails_5.1_active_admin_1.0.gemfile
+  - gemfiles/rails_5.1_active_admin_1.1.gemfile
 
 script: bundle exec rspec

Appraisals

@@ -8,3 +8,8 @@ appraise 'rails-5.1-active-admin-1.0' do
   gem 'rails', '~> 5.1'
   gem 'activeadmin', '~> 1.0'
 end
+
+appraise 'rails-5.1-active-admin-1.1' do
+  gem 'rails', '~> 5.1'
+  gem 'activeadmin', '~> 1.1'
+end

gemfiles/rails_5.1_active_admin_1.1.gemfile

@@ -0,0 +1,8 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rails", "~> 5.1"
+gem "activeadmin", "~> 1.1"
+
+gemspec path: "../"