Update README.md

README.md

@@ -101,8 +101,7 @@ An example of 'train' looks as follows.
 The data fields are the same among all splits.
 
 #### plain_text
-- `id`: a `string` feature.
-- `title`: a `string` feature.
+- `id`: a `int32` feature.
 - `context`: a `string` feature.
 - `question`: a `string` feature.
 - `answers`: a dictionary feature containing: