.travis.yml in ridgepole-0.7.8 vs .travis.yml in ridgepole-0.8.0.rc1

@@ -4,13 +4,14 @@
 language: ruby
 cache:
   - bundler
   - apt
 rvm:
-  - 2.4.6
-  - 2.5.5
-  - 2.6.3
+  - 2.3.8
+  - 2.4.5
+  - 2.5.3
+  - 2.6.0
 before_script:
   - sudo service mysql stop
   - sudo service postgresql stop
   - for i in {1..60}; do docker-compose up -d && break; sleep 1; done
   - function mysql_ping { mysqladmin -u root -h 127.0.0.1 -P 13316 -ppassword ping; }
@@ -23,10 +24,11 @@
   - bundle exec rake
 gemfile:
   - gemfiles/activerecord_5.0.gemfile
   - gemfiles/activerecord_5.1.gemfile
   - gemfiles/activerecord_5.2.gemfile
+  - gemfiles/activerecord_6.0.gemfile
 env:
   matrix:
     - MYSQL56=1
     - MYSQL57=1
     - POSTGRESQL=1
@@ -36,5 +38,11 @@
   apt:
     packages:
       - mysql-client-core-5.6
       - mysql-client-5.6
       - postgresql-client-9.4
+matrix:
+  exclude:
+    - rvm: 2.3.8
+      gemfile: gemfiles/activerecord_6.0.gemfile
+    - rvm: 2.4.5
+      gemfile: gemfiles/activerecord_6.0.gemfile