Fix warning

Author: Wilson Yuan

Demo/WSProgressHUD/FBShimmeringLayer.m

@@ -133,6 +133,10 @@ - (void)layoutSublayers
 @end
 
 @interface FBShimmeringLayer ()
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 100000
+// iOS 10 SDK has CALayerDelegate and CAAnimationDelegate as proper protocols.
+<CALayerDelegate, CAAnimationDelegate>
+#endif
 @property (strong, nonatomic) FBShimmeringMaskLayer *maskLayer;
 @end