Create travis.yml

Author: MartiUK

travis.yml

@@ -0,0 +1,14 @@
+language: ruby
+rvm:
+- 2.3
+
+before_script:
+ - chmod +x ./script/cibuild
+
+# Assume bundler is being used, therefore
+# the `install` step will run `bundle install` by default.
+script: ./script/cibuild
+
+env:
+  global:
+  - NOKOGIRI_USE_SYSTEM_LIBRARIES=true # speeds up installation of html-proofer