更新获取原图的方法注释

TZImagePickerController/TZImagePickerController/TZImageManager.h

@@ -57,6 +57,8 @@
 - (PHImageRequestID)getPhotoWithAsset:(id)asset completion:(void (^)(UIImage *photo,NSDictionary *info,BOOL isDegraded))completion progressHandler:(void (^)(double progress, NSError *error, BOOL *stop, NSDictionary *info))progressHandler networkAccessAllowed:(BOOL)networkAccessAllowed;
 - (PHImageRequestID)getPhotoWithAsset:(id)asset photoWidth:(CGFloat)photoWidth completion:(void (^)(UIImage *photo,NSDictionary *info,BOOL isDegraded))completion progressHandler:(void (^)(double progress, NSError *error, BOOL *stop, NSDictionary *info))progressHandler networkAccessAllowed:(BOOL)networkAccessAllowed;
 
+/// Get full Image 获取原图
+/// 该方法会先返回缩略图，再返回原图，如果info[PHImageResultIsDegradedKey] 为 YES，则表明当前返回的是缩略图，否则是原图。
 - (void)getOriginalPhotoWithAsset:(id)asset completion:(void (^)(UIImage *photo,NSDictionary *info))completion;
 - (void)getOriginalPhotoDataWithAsset:(id)asset completion:(void (^)(NSData *data,NSDictionary *info))completion;