Fix the wrong declaration of NSArray generics

@@ -39,7 +39,7 @@
 /**
  All coders in coders manager. The coders array is a priority queue, which means the later added coder will have the highest priority
  */
-@property (nonatomic, strong, readwrite, nullable) NSArray<SDWebImageCoder>* coders;
+@property (nonatomic, strong, readwrite, nullable) NSArray<id<SDWebImageCoder>> *coders;
 
 /**
  Add a new coder to the end of coders array. Which has the highest priority.

@@ -59,15 +59,15 @@
     });
 }
 
-- (NSArray<SDWebImageCoder> *)coders {
-    __block NSArray<SDWebImageCoder> *sortedCoders = nil;
+- (NSArray<id<SDWebImageCoder>> *)coders {
+    __block NSArray<id<SDWebImageCoder>> *sortedCoders = nil;
     dispatch_sync(self.mutableCodersAccessQueue, ^{
-        sortedCoders = (NSArray<SDWebImageCoder> *)[[[self.mutableCoders copy] reverseObjectEnumerator] allObjects];
+        sortedCoders = (NSArray<id<SDWebImageCoder>> *)[[[self.mutableCoders copy] reverseObjectEnumerator] allObjects];
     });
     return sortedCoders;
 }
 
-- (void)setCoders:(NSArray<SDWebImageCoder> *)coders {
+- (void)setCoders:(NSArray<id<SDWebImageCoder>> *)coders {
     dispatch_barrier_sync(self.mutableCodersAccessQueue, ^{
         self.mutableCoders = [coders mutableCopy];
     });