.travis.yml in petfinder-1.0.4 vs .travis.yml in petfinder-2.0.0

@@ -1,5 +1,6 @@
+---
 language: ruby
+cache: bundler
 rvm:
-  - 1.9.2
-  - 1.9.3
-  - 2.0.0
+  - 2.7.0
+before_install: gem install bundler -v 2.1.2