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

@@ -17,7 +17,6 @@ task_categories:
 - token-classification
 task_ids:
 - named-entity-recognition
-paperswithcode_id: null
 pretty_name: Swedish NER Corpus
 dataset_info:
   features:
@@ -29,11 +28,11 @@ dataset_info:
     sequence:
       class_label:
         names:
-          0: '0'
-          1: LOC
-          2: MISC
-          3: ORG
-          4: PER
+          '0': '0'
+          '1': LOC
+          '2': MISC
+          '3': ORG
+          '4': PER
   splits:
   - name: train
     num_bytes: 2032630