Add missing label for emotion description (#4151)

Co-authored-by: lijiazheng99 <[email protected]>

Commit from https://github.com/huggingface/datasets/commit/9314b2cf4c7e3f9deb01f12ab603d92e493551d0

README.md

@@ -107,7 +107,7 @@ The data fields are the same among all splits.
 
 #### default
 - `text`: a `string` feature.
-- `label`: a classification label, with possible values including `sadness` (0), `joy` (1), `love` (2), `anger` (3), `fear` (4).
+- `label`: a classification label, with possible values including `sadness` (0), `joy` (1), `love` (2), `anger` (3), `fear` (4), `surprise` (5).
 
 #### emotion
 - `text`: a `string` feature.