update travis config

Author: Fivell

.travis.yml

@@ -1,14 +1,13 @@
 script: bundle exec rspec spec
 env:
   matrix:
-    - RAILS=4.0.13
-    - RAILS=4.1.5
     - RAILS=4.2.6
+    - RAILS=5.0.0
 rvm:
-  - 2.1.5
-  - 2.2.0
-  - 2.3.0
+  - 2.2.6
+  - 2.3.3
 before_install:
-  - gem install bundler -v '= 1.9.3'
   - gem update --system
+  - rvm @global do gem uninstall bundler -a -x
+  - rvm @global do gem install bundler -v 1.14.6
   - gem --version

Gemfile

@@ -3,11 +3,11 @@ source 'https://rubygems.org'
 # Specify your gem's dependencies in active_admin_datetimepicker.gemspec
 gemspec
 group :test do
-  default_rails_version = '4.2.6'
+  default_rails_version = '4.2.7'
   gem 'sprockets-rails', '2.3.3'
   gem 'rails', "#{ENV['RAILS'] || default_rails_version}"
   gem 'rspec-rails'
-  gem 'activeadmin', github: 'activeadmin'  , ref: 'd787029e5523be2eb2ed99816eb0cecca2b72862'
+  gem 'activeadmin', github: 'activeadmin', ref: '06aa8b2af692e46fc360832473ca63e23a70b3d4'
   gem 'coveralls', require: false # Test coverage website. Go to https://coveralls.io
   gem 'sass-rails'
   gem 'sqlite3'