.travis.yml in erd-0.4.0 vs .travis.yml in erd-0.5.0

@@ -1,7 +1,52 @@
 language: ruby
 
-rvm:
-  - 2.3.0
+sudo: false
 
+addons:
+  apt:
+    packages:
+      - graphviz
+  chrome: stable
+
+cache:
+  - apt
+  - bundler
+
 before_install:
- - sudo apt-get install graphviz
+  - sudo apt update -qq
+  - sudo apt install -y chromium-chromedriver
+  - sudo ln -s /usr/lib/chromium-browser/chromedriver /usr/bin/
+  - gem install bundler
+
+rvm:
+  - 2.5.3
+  - 2.0.0
+
+gemfile:
+  - gemfiles/rails_52.gemfile
+  - gemfiles/rails_51.gemfile
+  - gemfiles/rails_50.gemfile
+  - gemfiles/rails_42.gemfile
+  - gemfiles/rails_41.gemfile
+  - gemfiles/rails_40.gemfile
+  - gemfiles/rails_32.gemfile
+
+matrix:
+  exclude:
+    - rvm: 2.0.0
+      gemfile: gemfiles/rails_52.gemfile
+    - rvm: 2.0.0
+      gemfile: gemfiles/rails_51.gemfile
+    - rvm: 2.0.0
+      gemfile: gemfiles/rails_50.gemfile
+    - rvm: 2.5.3
+      gemfile: gemfiles/rails_42.gemfile
+    - rvm: 2.5.3
+      gemfile: gemfiles/rails_41.gemfile
+    - rvm: 2.5.3
+      gemfile: gemfiles/rails_40.gemfile
+    - rvm: 2.5.3
+      gemfile: gemfiles/rails_32.gemfile
+  include:
+    - rvm: 1.8.7
+      gemfile: gemfiles/rails_32.gemfile