make isort more stable across environments

.pre-commit-config.yaml

@@ -1,12 +1,10 @@
 repos:
-- repo: local
+- repo: https://github.com/pre-commit/mirrors-isort
+  rev: v4.3.21
   hooks:
   - id: isort
-    require_serial: true
-    language: python
-    name: isort
-    entry: isort
-    types: [python]
+    additional_dependencies:
+      - "toml>=0.10"
 - repo: https://github.com/python/black
   rev: 19.3b0
   hooks:

pyproject.toml

@@ -53,7 +53,7 @@ pytest-cov = "^2.8"
 flake8 = "^3.7"
 #TODO unpin once it's more stable
 black = {version = "19.3b0", allows-prereleases = true}
-isort = "^4.3"
+isort ={version="^4.3", extras = ["pyproject"]}
 
 [tool.black]
 line-length = 119
@@ -64,6 +64,8 @@ include = '\.pyi?$'
 line_Length = 119
 multi_line_output = 3
 include_trailing_comma = true
+default_section="THIRDPARTY"
+known_first_party = ["esque", "tests"]
 
 [build-system]
 #TODO unpin once it's more stable