added codecov.io coverage

Author: sokra

.travis.yml

@@ -9,4 +9,7 @@ script: npm run travis
 before_install:
   - '[ "${TRAVIS_NODE_VERSION}" != "0.10" ] || npm install -g npm'
 
-after_success: cat ./coverage/lcov.info | node_modules/.bin/coveralls --verbose && rm -rf ./coverage
+after_success:
+  - cat ./coverage/lcov.info | node_modules/.bin/coveralls --verbose
+  - cat ./coverage/coverage.json | node_modules/codecov.io/bin/codecov.io.js
+  - rm -rf ./coverage

README.md

@@ -37,7 +37,10 @@ npm build
 npm test
 ```
 
-[![Build Status](https://travis-ci.org/css-modules/postcss-modules-extract-imports.svg?branch=master)](https://travis-ci.org/css-modules/postcss-modules-extract-imports) [![Coverage Status](https://coveralls.io/repos/css-modules/postcss-modules-extract-imports/badge.svg?branch=master)](https://coveralls.io/r/css-modules/postcss-modules-extract-imports?branch=master)
+[![Build Status](https://travis-ci.org/css-modules/postcss-modules-extract-imports.svg?branch=master)](https://travis-ci.org/css-modules/postcss-modules-extract-imports)
+
+* Lines: [![Coverage Status](https://coveralls.io/repos/css-modules/postcss-modules-extract-imports/badge.svg?branch=master)](https://coveralls.io/r/css-modules/postcss-modules-extract-imports?branch=master)
+* Statements: [![codecov.io](http://codecov.io/github/css-modules/postcss-modules-extract-imports/coverage.svg?branch=master)](http://codecov.io/github/css-modules/postcss-modules-extract-imports?branch=master)
 
 ## Development