Update README.md

README.md

@@ -55,7 +55,7 @@ The following data fields are provided for each split:
 `title`: (**str**) A short post title.  
 `text`: (**str**) The full text of the post.  
 `url`: (**str**) The URL which links to the original unprocessed post.  
-`category`: (**class label**): The class label of the post.  
+`category`: (**str**): The class label of the post.  
 
 ### Data Splits