.travis.yml in dude-cli-1.0.2 vs .travis.yml in dude-cli-2.0.0

@@ -1,5 +1,6 @@
-sudo: false
+---
 language: ruby
+cache: bundler
 rvm:
-  - 2.4.0
-before_install: gem install bundler -v 1.16.0
+  - 2.7.2
+before_install: gem install bundler -v 2.1.4