.travis.yml in active_admin_datetimepicker-0.6.3 vs .travis.yml in active_admin_datetimepicker-0.7.0

@@ -1,18 +1,22 @@
 sudo: required
 language: ruby
 addons:
   chrome: stable
 
-before_install: gem install bundler -v 1.16.0.pre.3
+before_install:
+  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
+  - gem install bundler -v '< 2'
 
 script: bundle exec rspec spec
 
 env:
   matrix:
-    - RAILS=4.2.10 AA=1.1.0
-    - RAILS=5.1.0 AA=1.2.1
-    - RAILS=5.2.1 AA=1.3.1
+    - RAILS=4.2.0 AA=1.1.0
+    - RAILS=5.1.0 AA=1.2.0
+    - RAILS=5.2.0 AA=1.3.0
+    - RAILS=5.2.0 AA=1.4.0
+    - RAILS=5.2.0 AA=2.0.0
+
 rvm:
-  - 2.3
   - 2.4
-  - 2.5
+  - 2.6