.travis.yml in fusuma-plugin-wmctrl-0.1.0 vs .travis.yml in fusuma-plugin-wmctrl-0.2.0

@@ -1,7 +1,10 @@
 ---
 sudo: false
 language: ruby
 cache: bundler
 rvm:
-  - 2.4.1
-before_install: gem install bundler -v 2.0.1
+  - 2.3.1
+  - 2.4
+  - 2.5
+  - 2.6
+before_install: gem install bundler --no-document -v 2.0.1