Move formatter settings

pyproject.toml

@@ -0,0 +1,7 @@
+[tool.black]
+line-length = 120
+
+[tool.isort]
+profile = "black"
+multi_line_output = 3
+line_length = 120

tox.ini

@@ -10,7 +10,7 @@ deps =
 skip_install = True
 commands =
     isort bdfr tests
-    black bdfr tests --line-length 120
+    black bdfr tests
 
 [testenv:format_check]
 deps =
@@ -20,10 +20,5 @@ skip_install = True
 allowlist_externals = mdl
 commands =
     isort bdfr tests --check
-    black bdfr tests --line-length 120 --check
+    black bdfr tests --check
     mdl README.md docs/ -s .markdown_style.rb
-
-[isort]
-profile = black
-multi_line_output = 3
-line_length = 120