.travis.yml in svmkit-0.2.2 vs .travis.yml in svmkit-0.2.3

@@ -1,10 +1,11 @@
 sudo: false
 os: linux
 dist: trusty
 language: ruby
 rvm:
-  - 2.2.9
-  - 2.3.6
-  - 2.4.3
+  - 2.2
+  - 2.3
+  - 2.4
+  - 2.5
 before_install:
   - gem install --no-document bundler -v '~> 1.16'