improve readme

README.md

@@ -1,10 +1,15 @@
 # retry-as-promised
 
+Retry promises when they fail, based upon [any-promise](https://github.com/kevinbeaty/any-promise).
+
+## Installation
+
 ```sh
 $ npm install --save retry-as-promised
+$ yarn add retry-as-promised
 ```
 
-Retry a failed promise
+## Configuration
 
 ```js
 var retry = require('retry-as-promised');
@@ -17,19 +22,19 @@ return retry(function (options) {
   return promise;
 }, {
   max: 3, // maximum amount of tries
-  timeout: 10000 // throw if no response or error within milisecnd timeout, default: undefined,
+  timeout: 10000 // throw if no response or error within millisecond timeout, default: undefined,
   match: [ // Must match error signature (ala bluebird catch) to continue
     Sequelize.ConnectionError,
     'SQLITE_BUSY'
   ],
   backoffBase: 1000 // Initial backoff duration in ms. Default: 100,
   backoffExponent: 1.5 // Exponent to increase backoff each try. Default: 1.1
   report: warningFn, // the function used for reporting; must have a (string, object) argument signature, where string is the message that will passed in by retry-as-promised, and the object will be this configuration object + the $current property
-  name:  'SourceX', // if user supplies string, it will be used when composing error/reporting messages; else if retry gets a callback, uses callback name in erroring/reporting; else (default) uses litteral string 'unknown'
-  Promise: Promise // Promise instance to create promises with
+  name:  'SourceX' // if user supplies string, it will be used when composing error/reporting messages; else if retry gets a callback, uses callback name in erroring/reporting; else (default) uses literal string 'unknown'
 });
 ```
 
 ## Tested with
 
 - Bluebird
+- Q