update libraries && add travis build

Author: rwieruch

.travis.yml

@@ -0,0 +1,10 @@
+language: node_js
+
+node_js:
+  - stable
+
+install:
+  - npm install
+
+script:
+  - npm test

README.md

@@ -1,5 +1,7 @@
 # Multivariate Linear Regression with Normal Equation
 
+[![Build Status](https://travis-ci.org/javascript-machine-learning/multivariate-linear-regression-normal-equation-javascript.svg?branch=master)](https://travis-ci.org/javascript-machine-learning/multivariate-linear-regression-normal-equation-javascript)
+
 This example project demonstrates how the normal equation may be used to solve a [multivariate linear regression](http://en.wikipedia.org/wiki/Linear_regression) problem.
 
 [Read more about it here.](https://www.robinwieruch.de/multivariate-linear-regression-normal-equation-javascript/)