update libraries && add travis build

Author: rwieruch

Diff for: .travis.yml

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

Diff for: README.md

@@ -1,5 +1,7 @@
 # Multi-Class Classification Logistic Regression with Gradient Descent in JavaScript
 
+[![Build Status](https://travis-ci.org/javascript-machine-learning/multi-classification-logistic-regression-gradient-descent-javascript.svg?branch=master)](https://travis-ci.org/javascript-machine-learning/multi-classification-logistic-regression-gradient-descent-javascript)
+
 This example project demonstrates how [gradient descent](https://en.wikipedia.org/wiki/Gradient_descent) may be used to solve a multi-class classification problem with [logistic regression](https://en.wikipedia.org/wiki/Logistic_regression).
 
 It uses the [MNIST database](https://en.wikipedia.org/wiki/MNIST_database) to predict images of digits from 0 to 9.