Merge pull request #72 from github/set-up-travis-ci

Add travis.yml to enable CI

Author: mattyoho

.travis.yml

@@ -0,0 +1,13 @@
+---
+dist: xenial
+language: ruby
+script: script/test
+rvm:
+  - 2.4
+  - 2.5
+  - 2.6
+before_install: gem install re2
+addons:
+ apt:
+   packages:
+     - libre2-dev