.travis.yml in goodcheck-0.3.0 vs .travis.yml in goodcheck-1.0.0

@@ -1,5 +1,8 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.4.0
-before_install: gem install bundler -v 1.16.0
+  - 2.4.3
+  - 2.5.0
+before_install:
+  - gem update --system
+  - gem install bundler -v 1.16.0