.travis.yml in build-environment-1.1.4 vs .travis.yml in build-environment-1.1.5

@@ -1,15 +1,20 @@
 language: ruby
-sudo: false
-dist: trusty
+dist: xenial
 cache: bundler
-rvm:
-  - 2.1.8
-  - 2.2.4
-  - 2.3.0
-  - 2.4.0
-  - ruby-head
-  - jruby-head
+
 matrix:
+  include:
+    - rvm: 2.3
+    - rvm: 2.4
+    - rvm: 2.5
+    - rvm: 2.6
+    - rvm: truffleruby
+    - rvm: jruby-head
+      env: JRUBY_OPTS="--debug -X+O"
+    - rvm: ruby-head
+    - rvm: rbx-3
   allow_failures:
-    - rvm: "ruby-head"
-    - rvm: "jruby-head"
+    - rvm: ruby-head
+    - rvm: truffleruby
+    - rvm: jruby-head
+    - rvm: rbx-3