Added .travis.yml config (#411)

.vscode/.travis.yml

@@ -0,0 +1,21 @@
+branches:
+  only:
+    - master
+
+sudo: false
+
+os:
+  - osx
+
+language: node_js
+
+node_js:
+  - "lts/*"
+
+install:
+  - npm install
+
+before_script:
+  - npm install -g gulp-cli
+
+script: gulp