Bump setuptools dependency to 61

PEP 621 is supported in setuptools starting from version 61, not 60.

Author: Rongronggg9

pyproject.toml

@@ -28,7 +28,10 @@ classifiers = [
 ]
 
 [project.urls]
-github = "https://github.com/MagicStack/asyncpg"
+homepage = "https://github.com/MagicStack/asyncpg"
+documentation = "https://magicstack.github.io/asyncpg/current/"
+repository = "https://github.com/MagicStack/asyncpg"
+changelog = "https://github.com/MagicStack/asyncpg/releases"
 
 [project.optional-dependencies]
 test = [
@@ -43,14 +46,15 @@ docs = [
 
 [build-system]
 requires = [
-    "setuptools>=60",
+    "setuptools>=61",
     "wheel",
 
     "Cython(>=0.29.24,<0.30.0)"
 ]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools]
+platforms = ["macOS", "POSIX", "Windows"]
 zip-safe = false
 
 [tool.setuptools.packages.find]

setup.py

@@ -17,9 +17,16 @@
 import re
 import subprocess
 
+import setuptools
+from distutils.version import StrictVersion
+
+if StrictVersion(setuptools.__version__) < StrictVersion('61.0.0'):
+    raise RuntimeError(f'Your setuptools version ({setuptools.__version__}) '
+                       f'does not support PEP 621. '
+                       'Please upgrade it first.')
+
 # We use vanilla build_ext, to avoid importing Cython via
 # the setuptools version.
-import setuptools
 from setuptools.command import build_py as setuptools_build_py
 from setuptools.command import sdist as setuptools_sdist
 from setuptools.command import build_ext as setuptools_build_ext
@@ -37,10 +44,6 @@
 _ROOT = pathlib.Path(__file__).parent
 
 
-with open(str(_ROOT / 'README.rst')) as f:
-    readme = f.read()
-
-
 with open(str(_ROOT / 'asyncpg' / '_version.py')) as f:
     for line in f:
         if line.startswith('__version__ ='):