config: fix no-proxy to noproxy

Author: jmannanc

doc/misc/npm-config.md

@@ -684,7 +684,7 @@ impact how lifecycle scripts are called.
 
 The node version to use when checking a package's `engines` map.
 
-### no-proxy
+### noproxy
 
 * Default: null
 * Type: String or Array

lib/config/defaults.js

@@ -195,7 +195,7 @@ Object.defineProperty(exports, 'defaults', {get: function () {
     'progress': !process.env.TRAVIS && !process.env.CI,
     proxy: null,
     'https-proxy': null,
-    'no-proxy': null,
+    'noproxy': null,
     'user-agent': 'npm/{npm-version} ' +
                     'node/{node-version} ' +
                     '{platform} ' +