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

@@ -1,5 +1,4 @@
 ---
-pretty_name: Mac-Morpho
 annotations_creators:
 - expert-generated
 language_creators:
@@ -18,7 +17,7 @@ task_categories:
 - token-classification
 task_ids:
 - part-of-speech
-paperswithcode_id: null
+pretty_name: Mac-Morpho
 dataset_info:
   features:
   - name: id
@@ -29,32 +28,32 @@ dataset_info:
     sequence:
       class_label:
         names:
-          0: PREP+PROADJ
-          1: IN
-          2: PREP+PRO-KS
-          3: NPROP
-          4: PREP+PROSUB
-          5: KC
-          6: PROPESS
-          7: NUM
-          8: PROADJ
-          9: PREP+ART
-          10: KS
-          11: PRO-KS
-          12: ADJ
-          13: ADV-KS
-          14: N
-          15: PREP
-          16: PROSUB
-          17: PREP+PROPESS
-          18: PDEN
-          19: V
-          20: PREP+ADV
-          21: PCP
-          22: CUR
-          23: ADV
-          24: PU
-          25: ART
+          '0': PREP+PROADJ
+          '1': IN
+          '2': PREP+PRO-KS
+          '3': NPROP
+          '4': PREP+PROSUB
+          '5': KC
+          '6': PROPESS
+          '7': NUM
+          '8': PROADJ
+          '9': PREP+ART
+          '10': KS
+          '11': PRO-KS
+          '12': ADJ
+          '13': ADV-KS
+          '14': N
+          '15': PREP
+          '16': PROSUB
+          '17': PREP+PROPESS
+          '18': PDEN
+          '19': V
+          '20': PREP+ADV
+          '21': PCP
+          '22': CUR
+          '23': ADV
+          '24': PU
+          '25': ART
   splits:
   - name: train
     num_bytes: 12635011