add isort to project

pyproject.toml

@@ -7,7 +7,6 @@ build-backend = "poetry.core.masonry.api"
 name = "pyrad3"
 version = "0.1.0"
 license = "MIT OR Apache-2.0"
-requires-python = ">=3.7"
 readme = "README.md"
 description = "RADIUS tools"
 keywords = ["AAA", "authentication", "authorization", "accounting", "RADIUS"]
@@ -35,10 +34,14 @@ include = [
 [tool.poetry.urls]
 repository = "https://github.com/pyradius/pyrad3"
 
+[tool.poetry.dependencies]
+python = "^3.7"
+
 
 [tool.poetry.dev-dependencies]
+black = "^19.3.10b0"
 pytest = "^5.4"
-pytest-black = "^0.30"
+pytest-black = "^0.3.10"
 pytest-cov = "^2.10"
 pytest-mypy = "^0.6"
 pytest-pylint = "^0.17"
@@ -49,5 +52,13 @@ line-length = 80
 include = '\.py'
 
 
+[tool.isort]
+multi_line_output = 3
+include_trailing_comma = true
+use_parentheses = true
+line_length = 88
+combine_as_imports = true
+
+
 [tool.pylint.messages_control]
 disable = "bad-continuation"