.travis.yml in object_identifier-0.3.0 vs .travis.yml in object_identifier-0.4.0

@@ -2,17 +2,15 @@
   global:
     - CC_TEST_REPORTER_ID=3b57e55dcd3cc40ee073715e7d75fa80ab7b7687cb8a420eac500d27b5cb28db
 sudo: false
 language: ruby
 rvm:
-  - 2.3.7
-  - 2.4.4
-  - 2.5.3
-  - 2.6.2
-  - ruby-head
+  - 2.4.9
+  - 2.5.8
+  - 2.6.6
 notifications:
   email: false
-before_install: gem install bundler -v 2.0.1
+before_install: gem install bundler -v 2.1.4
 cache: bundler
 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