.travis.yml in egn-1.3.3 vs .travis.yml in egn-1.3.4

@@ -1,6 +1,6 @@
 language: ruby
 rvm:
-  - "1.9.3"
-  - "2.0.0"
-  - "2.1.0"
+  - "2.2.7"
+  - "2.3.4"
+  - "2.4.1"
 script: bundle exec rspec spec