Add coverage

.travis.yml

@@ -5,3 +5,5 @@ node_js:
   - "6"
 notifications:
   email: false
+after_success:
+  - npm run coveralls

README.md

@@ -3,6 +3,7 @@
 [![npm version](https://img.shields.io/npm/v/bip.svg?style=flat-square)](https://www.npmjs.com/package/bip)
 [![npm downloads](https://img.shields.io/npm/dm/bip.svg?style=flat-square)](https://www.npmjs.com/package/bip)
 [![Build Status](https://img.shields.io/travis/lgaticaq/bip.svg?style=flat-square)](https://travis-ci.org/lgaticaq/bip)
+[![Coverage Status](https://img.shields.io/coveralls/lgaticaq/bip/master.svg?style=flat-square)](https://coveralls.io/github/lgaticaq/bip?branch=master)
 [![dependency Status](https://img.shields.io/david/lgaticaq/bip.svg?style=flat-square)](https://david-dm.org/lgaticaq/bip#info=dependencies)
 [![devDependency Status](https://img.shields.io/david/dev/lgaticaq/bip.svg?style=flat-square)](https://david-dm.org/lgaticaq/bip#info=devDependencies)
 [![Join the chat at https://gitter.im/lgaticaq/bip](https://img.shields.io/badge/gitter-join%20chat%20%E2%86%92-brightgreen.svg?style=flat-square)](https://gitter.im/lgaticaq/bip?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)

package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "lint": "eslint src",
     "clean": "rimraf lib",
-    "test": "mocha"
+    "test": "istanbul cover _mocha",
+    "coveralls": "coveralls < coverage/lcov.info"
   },
   "engines": {
     "node": ">=4"
@@ -32,7 +33,9 @@
   },
   "devDependencies": {
     "chai": "^3.5.0",
+    "coveralls": "^2.11.9",
     "eslint": "^2.9.0",
+    "istanbul": "^0.4.3",
     "mocha": "^2.4.5",
     "nock": "^8.0.0",
     "rimraf": "^2.5.2"