Switch isort away from pyproject.toml

Author: pradyunsg

.pre-commit-config.yaml

@@ -1,4 +1,5 @@
 repos:
+
 - repo: https://github.com/pre-commit/pre-commit-hooks
   rev: v2.5.0
   hooks:
@@ -28,7 +29,6 @@ repos:
   rev: 4.3.21
   hooks:
   - id: isort
-    additional_dependencies: [toml]
     files: \.py$
 
 - repo: https://github.com/psf/black

pyproject.toml

@@ -29,3 +29,18 @@ omit =
 [coverage:report]
 show_missing = False
 skip_covered = True
+
+[tool:isort]
+line_length = 88
+force_grid_wrap = 0
+
+multi_line_output = 3
+include_trailing_comma = True
+use_parentheses = True
+
+# No import comments, thanks.
+import_heading_future =
+import_heading_stdlib =
+import_heading_thirdparty =
+import_heading_firstparty =
+import_heading_localfolder =