Add codecov integration. (#1)

Author: beauby

README.md

@@ -5,6 +5,7 @@ Ruby gem for validating [JSON API](http://jsonapi.org) documents.
 
 [![Gem Version](https://badge.fury.io/rb/jsonapi-parser.svg)](https://badge.fury.io/rb/jsonapi-parser)
 [![Build Status](https://secure.travis-ci.org/jsonapi-rb/parser.svg?branch=master)](http://travis-ci.org/jsonapi-rb/parser?branch=master)
+[![codecov](https://codecov.io/gh/jsonapi-rb/parser/branch/master/graph/badge.svg)](https://codecov.io/gh/jsonapi-rb/parser)
 
 ## Installation
 ```ruby

jsonapi-parser.gemspec

@@ -17,4 +17,5 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'rake', '~> 11.3'
   spec.add_development_dependency 'rspec', '~> 3.5'
+  spec.add_development_dependency 'codecov', '~> 0.1'
 end

spec/response_spec.rb

@@ -1,4 +1,4 @@
-require 'jsonapi/parser'
+require 'spec_helper'
 
 describe JSONAPI::Parser, '.parse_response!' do
   it 'succeeds on nil data' do

spec/spec_helper.rb

@@ -0,0 +1,7 @@
+require 'simplecov'
+SimpleCov.start
+
+require 'codecov'
+SimpleCov.formatter = SimpleCov::Formatter::Codecov
+
+require 'jsonapi/parser'