Fix black formatter for Python 3.5

Author: mikicz

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.black]
 line-length = 120
-target_version = ['py37']
+target_version = ['py35', 'py36', 'py37', 'py38']
 include = '\.pyi?$'
 exclude = '''
 

pytracking/tracking.py

@@ -33,7 +33,7 @@ def __init__(
         include_default_metadata=False,
         encryption_bytestring_key=None,
         encoding="utf-8",
-        **kwargs,
+        **kwargs
     ):
         """