Add TravisCI

Author: dvanscott

.travis.yml

@@ -0,0 +1,11 @@
+language: node_js
+node_js:
+  - '10'
+  - '8'
+
+cache: yarn
+
+before_script:
+  - yarn install
+
+script: yarn test

README.md

@@ -3,6 +3,7 @@
 [![npm](https://img.shields.io/npm/v/@kirschbaum-development/tailwindcss-scale-utilities.svg)](https://www.npmjs.com/package/@kirschbaum-development/tailwindcss-scale-utilities)
 [![npm](https://img.shields.io/npm/dt/@kirschbaum-development/tailwindcss-scale-utilities.svg)](https://www.npmjs.com/package/@kirschbaum-development/tailwindcss-scale-utilities)
 [![license](https://img.shields.io/github/license/mashape/apistatus.svg)](https://www.npmjs.com/package/@kirschbaum-development/tailwindcss-scale-utilities)
+[![tests](https://travis-ci.org/kirschbaum-development/tailwindcss-scale-utilities.svg?branch=master)](https://travis-ci.org/kirschbaum-development/tailwindcss-scale-utilities)
 
 ## Installation