Migrate more project metadata to pyproject.toml

pyproject.toml

@@ -2,6 +2,26 @@
 requires = ["setuptools>=64", "setuptools-scm>=8"]
 build-backend = "setuptools.build_meta"
 
+[project]
+name = "bagit"
+dynamic = ["version"]
+description = "Create and validate BagIt packages"
+readme = {file = "README.rst", content-type = "text/x-rst"}
+authors = [
+    { name = "Ed Summers", email = "[email protected]" },
+]
+classifiers = [
+    "Intended Audience :: Developers",
+    "License :: Public Domain",
+    "Programming Language :: Python :: 3",
+    "Topic :: Communications :: File Sharing",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+    "Topic :: System :: Filesystems",
+]
+
+[project.urls]
+Homepage = "https://libraryofcongress.github.io/bagit-python/"
+
 [tool]
 
 [tool.setuptools_scm]

setup.py

@@ -62,24 +62,13 @@ def get_message_catalogs():
     platforms=["POSIX"],
     test_suite="test",
     setup_requires=["setuptools_scm"],
-    install_requires=["importlib_metadata ; python_version < '3.8'"],
     tests_require=tests_require,
     classifiers=[
         "License :: Public Domain",
         "Intended Audience :: Developers",
         "Topic :: Communications :: File Sharing",
         "Topic :: Software Development :: Libraries :: Python Modules",
         "Topic :: System :: Filesystems",
-        "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.1",
-        "Programming Language :: Python :: 3.2",
-        "Programming Language :: Python :: 3.3",
-        "Programming Language :: Python :: 3.4",
-        "Programming Language :: Python :: 3.5",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
-        "Programming Language :: Python :: 3.8",
     ],
 )