build: add coverage reporting

Author: dougwilson

.travis.yml

@@ -8,3 +8,4 @@ matrix:
     - node_js: "0.11"
   fast_finish: true
 script: "npm run-script test-travis"
+after_script: "npm install [email protected] && cat ./coverage/lcov.info | coveralls"

Readme.md

@@ -2,6 +2,7 @@
 
 [![NPM version](https://badge.fury.io/js/serve-static.svg)](http://badge.fury.io/js/serve-static)
 [![Build Status](https://travis-ci.org/expressjs/serve-static.svg?branch=master)](https://travis-ci.org/expressjs/serve-static)
+[![Coverage Status](https://img.shields.io/coveralls/expressjs/serve-static.svg?branch=master)](https://coveralls.io/r/expressjs/serve-static)
 
 Previously `connect.static()`.