Fix english in new method naming

UIImageView+WebCache.h

@@ -13,6 +13,6 @@
 
 - (void)setImageWithURL:(NSURL *)url;
 - (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholder;
-- (void)cancelCurrentImageLoading;
+- (void)cancelCurrentImageLoad;
 
 @end

UIImageView+WebCache.m

@@ -46,7 +46,7 @@
     }
 }
 
-- (void)cancelCurrentImageLoading
+- (void)cancelCurrentImageLoad
 {
     [[SDWebImageManager sharedManager] cancelForDelegate:self];
 }