Make classes final

src/CancellationQueue.php

@@ -2,7 +2,7 @@
 
 namespace React\Promise;
 
-class CancellationQueue
+final class CancellationQueue
 {
     private $started = false;
     private $queue = [];

src/Deferred.php

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

src/FulfilledPromise.php

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

src/LazyPromise.php

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

src/Promise.php

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

src/Queue/SynchronousQueue.php

@@ -2,7 +2,7 @@
 
 namespace React\Promise\Queue;
 
-class SynchronousQueue implements QueueInterface
+final class SynchronousQueue implements QueueInterface
 {
     private $queue = [];
 

src/RejectedPromise.php

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