feat!: refactor

BREAKING CHANGE: this module is now Promise only and no longer accepts a
callback parameter

Author: lukekarrys

README.md

@@ -2,25 +2,23 @@
 
 A node module to get your node module started.
 
-[![Build Status](https://secure.travis-ci.org/npm/init-package-json.svg)](http://travis-ci.org/npm/init-package-json)
-
 ## Usage
 
 ```javascript
-var init = require('init-package-json')
-var path = require('path')
+const init = require('init-package-json')
+const path = require('path')
 
 // a path to a promzard module.  In the event that this file is
 // not found, one will be provided for you.
-var initFile = path.resolve(process.env.HOME, '.npm-init')
+const initFile = path.resolve(process.env.HOME, '.npm-init')
 
 // the dir where we're doin stuff.
-var dir = process.cwd()
+const dir = process.cwd()
 
 // extra stuff that gets put into the PromZard module's context.
 // In npm, this is the resolved config object.  Exposed as 'config'
 // Optional.
-var configData = { some: 'extra stuff' }
+const configData = { some: 'extra stuff' }
 
 // Any existing stuff from the package.json file is also exposed in the
 // PromZard module as the `package` object.  There will also be three
@@ -29,16 +27,9 @@ var configData = { some: 'extra stuff' }
 // * `basename` the tip of the package dir
 // * `dirname` the parent of the package dir
 
-init(dir, initFile, configData, function (er, data) {
-  // the data's already been written to {dir}/package.json
-  // now you can do stuff with it
-})
-```
-
-Or from the command line:
-
-```
-$ npm-init
+const data = await init(dir, initFile, configData)
+// the data's already been written to {dir}/package.json
+// now you can do stuff with it
 ```
 
 See [PromZard](https://github.com/npm/promzard) for details about