Upgrade NPM packages and add CI (#6)

* Upgrade packages

* Add a CI build

Author: kfarnung

.travis.yml

@@ -0,0 +1,14 @@
+language: node_js
+node_js:
+  - "8"
+  - "10"
+  - "12"
+  - "13"
+branches:
+  only:
+    - master
+cache:
+  directories:
+    - node_modules
+script:
+  - npm run build