Merge pull request #2 from fastred/format_specifiers

Fix incorrect string format specifier for NSInteger

AsyncDisplayKit/Private/_ASCoreAnimationExtras.mm

@@ -119,7 +119,7 @@ UIViewContentMode ASDisplayNodeUIContentModeFromNSString(NSString *string) {
       return UIContentModeCAGravityLUT[i].string;
     }
   }
-  ASDisplayNodeCAssert(contentMode == UIViewContentModeRedraw, @"Encountered an unknown contentMode %ld. Is this a new version of iOS?", contentMode);
+  ASDisplayNodeCAssert(contentMode == UIViewContentModeRedraw, @"Encountered an unknown contentMode %zd. Is this a new version of iOS?", contentMode);
   // Redraw is ok to return nil.
   return nil;
 }