Fix missing black as a dev dependency

Author: lqmanh

Diff for: pyproject.toml

@@ -15,6 +15,7 @@ requests = "2.25.1"
 
 [tool.poetry.dev-dependencies]
 pre_commit = "^2.1.0"
+black = "^21.7b0"
 
 [build-system]
 requires = ["poetry>=0.12", "setuptools>=30.3.0,<50"]

Diff for: supabase_py/lib/constants.py

@@ -1,5 +1,3 @@
 from supabase_py import __version__
 
-DEFAULT_HEADERS = {
-    'X-Client-Info': f'supabase-py/{__version__}'
-}
+DEFAULT_HEADERS = {"X-Client-Info": f"supabase-py/{__version__}"}