.travis.yml in europeana-blacklight-1.2.2 vs .travis.yml in europeana-blacklight-1.3.0

@@ -1,17 +1,19 @@
 language: ruby
 rvm:
   - 2.3
   - 2.4
   - 2.5
+  - 2.6
 notifications:
   email: false
 sudo: false
 cache:
   bundler: true
+# Downgrade bundler to 1.x <https://docs.travis-ci.com/user/languages/ruby/#bundler-20>
 before_install:
-  - gem update --system
-  - gem install bundler
+  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
+  - gem install bundler -v '< 2'
 before_script:
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
   - chmod +x ./cc-test-reporter
   - ./cc-test-reporter before-build
 script: