Remove unneeded PromisorInterface

Author: clue

README.md

@@ -45,7 +45,6 @@ Table of Contents
      * [some()](#some)
      * [map()](#map)
      * [reduce()](#reduce)
-   * [PromisorInterface](#promisorinterface)
 4. [Examples](#examples)
    * [How to use Deferred](#how-to-use-deferred)
    * [How promise forwarding works](#how-promise-forwarding-works)
@@ -486,12 +485,6 @@ promises and/or values, and `$reduceFunc` may return either a value or a
 promise, *and* `$initialValue` may be a promise or a value for the starting
 value.
 
-### PromisorInterface
-
-The `React\Promise\PromisorInterface` provides a common interface for objects
-that provide a promise. `React\Promise\Deferred` implements it, but since it
-is part of the public API anyone can implement it.
-
 Examples
 --------
 

src/Deferred.php

@@ -2,7 +2,7 @@
 
 namespace React\Promise;
 
-final class Deferred implements PromisorInterface
+final class Deferred
 {
     private $promise;
     private $resolveCallback;