.travis.yml in cose-0.1.0 vs .travis.yml in cose-0.2.0

@@ -1,5 +1,13 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.5.1
-before_install: gem install bundler -v 1.16.2
+  - ruby-head
+  - 2.6.1
+  - 2.5.3
+  - 2.4.5
+before_install: gem install bundler -v 2.0.1
+
+matrix:
+  fast_finish: true
+  allow_failures:
+    - rvm: ruby-head