Add Travis CI config

.travis.yml

@@ -0,0 +1,24 @@
+language: node_js
+node_js:
+  - '8'
+  - '9'
+
+cache: yarn
+
+install: yarn
+script:
+  - yarn lint
+  - yarn test
+
+jobs:
+  include:
+    - stage: npm release
+      if: tag IS present
+      node_js: '8'
+      deploy:
+        provider: npm
+        email: '$NPM_EMAIL'
+        api_key: '$NPM_TOKEN'
+        skip_cleanup: true
+        on:
+          tags: true