.travis.yml in ddr-alerts-1.1.0 vs .travis.yml in ddr-alerts-2.0.0.rc1

@@ -1,9 +1,9 @@
 language: ruby
 rvm:
-  - 2.3.1
+  - 2.5.3
 script: "bundle exec rake ci"
-cache: 
+cache:
   - bundler
   - apt
 notifications:
   email:
     - [e-mail]