Create .travis.yml

.travis.yml

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+# https://docs.travis-ci.com/user/languages/javascript-with-nodejs/
+language: node_js
+node_js:
+- 8
+script: npm run build
+cache:
+  directories:
+  - node_modules
+
+# deploy to gh-pages: https://docs.travis-ci.com/user/deployment/pages/
+deploy:
+  provider: pages
+  local-dir: dist
+  target-branch: gh-pages
+  skip-cleanup: true
+  github-token: $GITHUB_TOKEN  # set in the settings page of the repo on travis-ci.com
+  keep-history: true
+  on:
+    branch: master