.travis.yml in prezzo-0.2.1 vs .travis.yml in prezzo-0.2.2

@@ -1,8 +1,18 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.3.1
+  - 2.3.3
+  - 2.4.0
+  - ruby-head
+  - jruby-9.1.7.0
+  - jruby-head
+
+matrix:
+  allow_failures:
+    - rvm: 2.4.0
+    - rvm: ruby-head
+    - rvm: jruby-head
 
 addons:
   code_climate:
     repo_token: b05bb78bfd6dbb9fb7f55d520f63e7d981f13a69de06aa2ae5ebd69a1e01789e