Remove CancellablePromiseInterface retained for BC only

Author: jsor

CHANGELOG.md

@@ -14,6 +14,4 @@ CHANGELOG for 3.x
       supported, other input types resolved to empty arrays or `null`. (#35).
     * BC break: The interfaces `PromiseInterface`, `ExtendedPromiseInterface`
       and `CancellablePromiseInterface` have been merged into a single
-      `PromiseInterface`. The `CancellablePromiseInterface` has been kept for
-      backward compatibility but is marked as deprecated and must not be used
-      anymore.
+      `PromiseInterface`.

src/CancellablePromiseInterface.php

@@ -2,7 +2,7 @@
 
 namespace React\Promise;
 
-class FulfilledPromise implements PromiseInterface, CancellablePromiseInterface
+class FulfilledPromise implements PromiseInterface
 {
     private $value;
 

src/FulfilledPromise.php

@@ -2,7 +2,7 @@
 
 namespace React\Promise;
 
-class LazyPromise implements PromiseInterface, CancellablePromiseInterface
+class LazyPromise implements PromiseInterface
 {
     private $factory;
     private $promise;

src/LazyPromise.php

@@ -2,7 +2,7 @@
 
 namespace React\Promise;
 
-class Promise implements PromiseInterface, CancellablePromiseInterface
+class Promise implements PromiseInterface
 {
     private $canceller;
     private $result;

src/Promise.php

@@ -2,7 +2,7 @@
 
 namespace React\Promise;
 
-class RejectedPromise implements PromiseInterface, CancellablePromiseInterface
+class RejectedPromise implements PromiseInterface
 {
     private $reason;