.travis.yml in capybara-screenshot_config-0.1.0 vs .travis.yml in capybara-screenshot_config-0.2.0

@@ -1,4 +1,5 @@
 language: ruby
+cache: bundler
 rvm:
-  - 2.2.2
-before_install: gem install bundler -v 1.10.6
+  - 2.2.5
+  - 2.3.1