add travis deploy

.travis.yml

@@ -13,4 +13,12 @@ env:
   global:
   - NOKOGIRI_USE_SYSTEM_LIBRARIES=true # speeds up installation of html-proofer
 
-sudo: false # route your build to the container-based infrastructure for a faster build
+sudo: false # route your build to the container-based infrastructure for a faster build
+
+deploy:
+  provider: pages
+  skip-cleanup: true
+  github-token: $GITHUB_TOKEN  # Set in the settings page of your repository, as a secure variable
+  keep-history: true
+  on:
+    branch: master