Add build badge

Author: nisshiee

README.md

@@ -1,5 +1,7 @@
 # ValidationExamplesMatcher
 
+[![Build Status](https://travis-ci.org/nisshiee/validation_examples_matcher.svg?branch=master)](https://travis-ci.org/nisshiee/validation_examples_matcher)
+
 Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/validation_examples_matcher`. To experiment with that code, run `bin/console` for an interactive prompt.
 
 TODO: Delete this and the text above, and describe your gem