.travis.yml in minimart-1.2.3 vs .travis.yml in minimart-1.2.4

@@ -1,10 +1,10 @@
 language: ruby
 cache: bundler
 rvm:
-  - 2.3.1
-  - 2.2.3
-  - 2.1.7
+  - 2.4.0
+  - 2.3.3
+  - 2.2.6
 script:
   - bundle exec rake
   - bundle exec rake install
 notifications:
   flowdock: