Add namespaces to readme

Author: bhousel

README.md

@@ -1,4 +1,4 @@
-[![npm version](https://badge.fury.io/js/spritezero-cli.svg)](https://badge.fury.io/js/spritezero-cli)
+[![npm version](https://badge.fury.io/js/%40mapbox%2Fspritezero-cli.svg)](https://badge.fury.io/js/%40mapbox%2Fspritezero-cli)
 [![build status](https://secure.travis-ci.org/mapbox/spritezero-cli.svg?branch=master)](http://travis-ci.org/mapbox/spritezero-cli)
 
 # spritezero-cli
@@ -7,7 +7,7 @@ A command-line interface to [spritezero](https://github.com/mapbox/spritezero).
 
 ## Installation
 
-    npm install -g spritezero-cli
+    npm install -g @mapbox/spritezero-cli
 
 ## Usage