.travis.yml in trestle-search-0.4.1 vs .travis.yml in trestle-search-0.4.2

@@ -1,5 +1,22 @@
-sudo: false
 language: ruby
+
+cache: bundler
+
+before_install:
+  - gem update --system
+  - gem install bundler
+
 rvm:
-  - 2.3.1
-before_install: gem install bundler -v 1.12.5
+  - 2.6.5
+
+gemfile:
+  - gemfiles/rails-5.0.gemfile
+  - gemfiles/rails-5.1.gemfile
+  - gemfiles/rails-5.2.gemfile
+  - gemfiles/rails-6.0.gemfile
+
+jobs:
+  include:
+    gemfile: gemfiles/rails-4.2.gemfile
+    before_install:
+      - gem install bundler -v '< 2'