remove deprecated parameter

required to work with python 3.9

wit.py

@@ -75,7 +75,7 @@ class Wit(datasets.GeneratorBasedBuilder):
             with open(filepath, "rb") as f:
                 for i, line in enumerate(f):
                     line = line.strip()
-                    row_data = json.loads(line, encoding='utf-8')
+                    row_data = json.loads(line)
                     for feature in row_data['wit_features']:
                         
                         # If a feature is missing from feature dict, add it as None