.travis.yml in rack-request-object-logger-1.1.0 vs .travis.yml in rack-request-object-logger-2.0.1

@@ -4,5 +4,12 @@
   - 2.2.6
   - 2.3.3
   - 2.4.0
   - jruby-9.1.6.0
 before_install: gem install bundler -v 1.13.7
+cache: bundler
+matrix:
+  include:
+     - rvm: ruby-head
+  allow_failures:
+    - rvm: ruby-head
+  fast_finish: true
\ No newline at end of file