.travis.yml in mini_portile2-2.2.0.rc1 vs .travis.yml in mini_portile2-2.2.0

@@ -1,12 +1,15 @@
---
+---
 language: ruby
 sudo: false
-rvm:
-  - 1.9.3
-  - 2.0
-  - 2.1
-  - 2.2
-  - 2.3.0
-  - ruby-head
-  - jruby-1.7.23
-  - jruby-9.0.4.0
+matrix:
+  include:
+  - rvm: 1.9.3
+  - rvm: 2.0
+  - rvm: 2.1
+  - rvm: 2.2.5
+  - rvm: 2.3.1
+  - rvm: 2.4.0
+    env:
+      - RUBYOPT="--enable-frozen-string-literal --debug=frozen-string-literal"
+  - rvm: jruby-1.7
+  - rvm: jruby-9.1.5.0