.travis.yml in hydra-derivatives-3.2.2 vs .travis.yml in hydra-derivatives-3.3.0

- old
+ new

@@ -4,11 +4,11 @@
 before_install:
   - gem update --system
   - gem install bundler
 rvm:
   - 2.2.5
-  - 2.3.1
-  - 2.4.0
+  - 2.3.4
+  - 2.4.1
 env:
   global:
     - NOKOGIRI_USE_SYSTEM_LIBRARIES=true
 jdk:
   - oraclejdk8