Use npm instead NPM and update twbs team link.

README.md

 # [Bootstrap](http://getbootstrap.com)
 [![Bower version](https://badge.fury.io/bo/bootstrap.svg)](http://badge.fury.io/bo/bootstrap)
-[![NPM version](https://badge.fury.io/js/bootstrap.svg)](http://badge.fury.io/js/bootstrap)
+[![npm version](https://badge.fury.io/js/bootstrap.svg)](http://badge.fury.io/js/bootstrap)
 [![Build Status](https://secure.travis-ci.org/twbs/bootstrap.svg?branch=master)](https://travis-ci.org/twbs/bootstrap)
 [![devDependency Status](https://david-dm.org/twbs/bootstrap/dev-status.svg)](https://david-dm.org/twbs/bootstrap#info=devDependencies)
 [![Selenium Test Status](https://saucelabs.com/browser-matrix/bootstrap.svg)](https://saucelabs.com/u/bootstrap)
 
-Bootstrap is a sleek, intuitive, and powerful front-end framework for faster and easier web development, created by [Mark Otto](https://twitter.com/mdo) and [Jacob Thornton](https://twitter.com/fat), and maintained by the [core team](https://github.com/twbs?tab=members) with the massive support and involvement of the community.
+Bootstrap is a sleek, intuitive, and powerful front-end framework for faster and easier web development, created by [Mark Otto](https://twitter.com/mdo) and [Jacob Thornton](https://twitter.com/fat), and maintained by the [core team](https://github.com/orgs/twbs/people) with the massive support and involvement of the community.
 
 To get started, check out <http://getbootstrap.com>!