Replace YAML keys from int to str

Replace YAML metadata integer keys with strings, as the Hub does not support integers.
See: https://github.com/huggingface/datasets/issues/5275

README.md

@@ -7,7 +7,6 @@ language:
 - zu
 license:
 - other
-license_details: Creative Commons Attribution 2.5 South Africa
 multilinguality:
 - monolingual
 size_categories:
@@ -18,8 +17,8 @@ task_categories:
 - token-classification
 task_ids:
 - named-entity-recognition
-paperswithcode_id: null
 pretty_name: Isizulu Ner Corpus
+license_details: Creative Commons Attribution 2.5 South Africa
 dataset_info:
   features:
   - name: id
@@ -30,15 +29,15 @@ dataset_info:
     sequence:
       class_label:
         names:
-          0: OUT
-          1: B-PERS
-          2: I-PERS
-          3: B-ORG
-          4: I-ORG
-          5: B-LOC
-          6: I-LOC
-          7: B-MISC
-          8: I-MISC
+          '0': OUT
+          '1': B-PERS
+          '2': I-PERS
+          '3': B-ORG
+          '4': I-ORG
+          '5': B-LOC
+          '6': I-LOC
+          '7': B-MISC
+          '8': I-MISC
   config_name: isizulu_ner_corpus
   splits:
   - name: train