chore: add travis badge to readme (#7)

README.md

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 > Scrape football data from Bet365
 
 [![npm version](https://badge.fury.io/js/soccer-scrape.svg)](https://badge.fury.io/js/soccer-scrape)
+[![build status](https://travis-ci.org/o8e/soccer-scrape.svg?branch=master)](https://travis-ci.org/o8e/soccer-scrape)
 
 A pretty rigid library to fetch todays __unplayed__ fixtures. It currently only supports three attributes, and comes from a defined source, Bet365, because they have the most extensive, whacky leagues available.