adding travis CI

Author: jkyberneees

.travis.yml

@@ -0,0 +1,8 @@
+language: node_js
+node_js:
+  - "8"
+
+before_install:
+# package-lock.json was introduced in npm@5
+- '[[ $(node -v) =~ ^v9.*$ ]] || npm install -g npm@latest' # skipped when using node 9
+install: npm install