Update readme to reflect v2.0.0 API

README.md

@@ -1,6 +1,6 @@
 # ngo [![NPM version](https://badge.fury.io/js/ngo.svg)](https://npmjs.org/package/ngo)   [![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](https://github.com/feross/standard)
 
-> Run go commands, whether your go env is in place or not
+> Run go commands, whether your GO env is in place or not
 
 Will download latest binaries locally if GO isn't already in PATH
 
@@ -18,40 +18,30 @@ $ npm install --global ngo
 
 ## api
 
-### ngo
-returns promise which resolves to [`execa`](https://github.com/sindresorhus/execa) styled object
-- **arguments** *(Array, arguments to call with `go` command - required)*
+### require('ngo')(opts)
+accepts `opts` as below, returns `ngo` function which executes GO commands
 - **options** *(Object - optional)*
   - **useLocal** *(Boolean, use locally downloaded GO binaries - optional)*
   - **env** *(Object, environment vars to set for the GO command - optional)*
   - **goRoot** *(String, GO root path (ex. `/usr/local/go`) - optional)*
   - **goPath** *(String, GO workspace path (ex. `~/work`) - optional)*
-  - **reject** *(Boolean, set to `false` to resolve the promise on stderr instead of rejecting - optional)*
-
-### ngo.init
-returns promise that resolves when `ngo` is ready for `cmd`
-- **options** *(Object - optional)*
-  - **useLocal** *(Boolean, use locally downloaded GO binaries - optional)*
 
-### ngo.cmd
-returns `execa` styled [`child_process`](https://nodejs.org/api/child_process.html#child_process_class_childprocess) instance with promise-cuity
-- **command** *(String, (ex. 'build') - optional - if ommitted signature is shifted)*
-- **arguments** *(Array, arguments to call with `go` command - optional)*
+### ngo(arguments, options)
+returns promise which resolves to [`execa`](https://github.com/sindresorhus/execa) styled object
+- **arguments** *(Array | String, argument(s) to call with `go` command - required)*
 - **options** *(Object - optional)*
-  - **env** *(Object, environment vars to set for the GO command - optional)*
-  - **goRoot** *(String, GO root path (ex. `/usr/local/go`) - optional)*
-  - **goPath** *(String, GO workspace path (ex. `~/work`) - optional)*
-  - **reject** *(Boolean, set to `false` to resolve the promise on stderr instead of rejecting - optional)*
+ - same options as [`child_process.spawn`](https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options)
+ - additonal options available same as [`execa`](https://github.com/sindresorhus/execa#options)
 
 ## usage
 
 #### cli usage
 ```sh
 $ ngo version
-# go version go1.7.1 windows/amd64
+# go version go1.8.3 windows/amd64
 ```
 
-#### default usage
+#### programmatic usage
 returns promise that resolves to `execa` style object without the `child_process` goodies
 
 ```js
@@ -60,7 +50,7 @@ const ngo = require('ngo')(goOpts)
 
 ngo('version').then(console.log).catch(console.error)
 /* {
-  stdout: 'go version go1.7.1 windows/amd64',
+  stdout: 'go version go1.8.3 windows/amd64',
   stderr: '',
   code: 0,
   failed: false,