.travis.yml in u-case-4.2.2 vs .travis.yml in u-case-4.3.0

@@ -1,22 +1,25 @@
-
 language: ruby
 
-sudo: false
+cache:
+  bundler: true
+  directories:
+    - /home/travis/.rvm/
 
 rvm:
-- 2.2.0
+- 2.2.2
 - 2.3.0
 - 2.4.0
 - 2.5.0
 - 2.6.0
 - 2.7.0
+- 3.0.0
 
-cache: bundler
+env:
+  - BUNDLER_V1="1.17.3"
 
 before_install:
-  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
-  - gem install bundler -v '< 2'
+  - gem install bundler -v "$BUNDLER_V1"
 
 install: bundle install --jobs=3 --retry=3
 
 before_script:
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter