.travis.yml in zero-rails_openapi-2.1.4 vs .travis.yml in zero-rails_openapi-2.1.5

@@ -1,9 +1,9 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.4.0
-before_install: gem install bundler -v 1.16.0.pre.2
+  - 2.7.1
+before_install: gem install bundler -v 2.1.4
 env:
   global:
     - CC_TEST_REPORTER_ID=fd0a238819079b92c19e99f5f4d6dcc8a5b5b2baf087fceb3723837604b5b0e9
 before_script:
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter