.travis.yml in undercover-0.2.1 vs .travis.yml in undercover-0.2.2

@@ -1,9 +1,9 @@
 language: ruby
 rvm:
-  - 2.5.1
-  - 2.4.4
-  - 2.3.4
+  - 2.5.3
+  - 2.4.5
+  - 2.3.8
 before_install:
   - gem install bundler undercover
   - gem update --system
 script:
   - bundle exec rake