Use "whey" as the build backend.

Author: domdfcoding

MANIFEST.in

@@ -1,6 +1,6 @@
 [build-system]
-requires = [ "setuptools>=40.6.0", "wheel>=0.34.2",]
-build-backend = "setuptools.build_meta"
+requires = [ "whey",]
+build-backend = "whey"
 
 [project]
 name = "flake8-slots"
@@ -22,5 +22,19 @@ Homepage = "https://github.com/domdfcoding/flake8-slots"
 "Source Code" = "https://github.com/domdfcoding/flake8-slots"
 Documentation = "https://flake8-slots.readthedocs.io/en/latest"
 
+[tool.whey]
+base-classifiers = [
+    "Development Status :: 4 - Beta",
+    "Framework :: Flake8",
+    "Intended Audience :: Developers",
+    "Topic :: Utilities",
+    "Typing :: Typed",
+]
+python-versions = [ "3.6", "3.7", "3.8", "3.9",]
+python-implementations = [ "CPython", "PyPy",]
+platforms = [ "Windows", "macOS", "Linux",]
+license-key = "MIT"
+package = "flake8_slots"
+
 [project.entry-points."flake8.extension"]
 SLOTS = "flake8_slots:Plugin"

pyproject.toml

@@ -10,11 +10,13 @@ license: 'MIT'
 short_desc: "A Flake8 plugin to require __slots__ to be defined for subclasses of immutable types."
 min_coverage: 100
 
+python_deploy_version: 3.6
+use_whey: true
+docs_fail_on_warning: true
+
 conda_channels:
  - conda-forge
 
-python_deploy_version: 3.6
-
 # Versions to run tests for
 python_versions:
  - '3.6'
@@ -46,5 +48,3 @@ keywords:
 
 sphinx_conf_epilogue:
  - nitpicky = True
-
-docs_fail_on_warning: true

repo_helper.yml

@@ -48,8 +48,7 @@ commands = sphinx-build -M html . ./build {posargs}
 skip_install = True
 changedir = {toxinidir}
 deps =
-    virtualenv
-    git+https://github.com/pypa/build
+    build[virtualenv]>=0.3.1
     check-wheel-contents>=0.1.0
     twine>=3.2.0
 commands =