chore(pyproject): Normalize quotes

pyproject.toml

@@ -5,17 +5,17 @@ description = "SQLAlchemy models for UNIHAN CJK database"
 license = "MIT"
 authors = ["Tony Narlock <tony@git-pull.com>"]
 classifiers = [
-  'Development Status :: 4 - Beta',
+  "Development Status :: 4 - Beta",
   "License :: OSI Approved :: MIT License",
-  'Environment :: Web Environment',
-  'Intended Audience :: Developers',
-  'Programming Language :: Python',
-  'Programming Language :: Python :: 3',
-  'Programming Language :: Python :: 3.7',
-  'Programming Language :: Python :: 3.8',
-  'Programming Language :: Python :: 3.9',
-  'Programming Language :: Python :: 3.10',
-  'Programming Language :: Python :: Implementation :: PyPy',
+  "Environment :: Web Environment",
+  "Intended Audience :: Developers",
+  "Programming Language :: Python",
+  "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3.7",
+  "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: Implementation :: PyPy",
   "Topic :: Database",
   "Topic :: Software Development :: Internationalization",
   "Topic :: Software Development :: Localization",
@@ -31,7 +31,7 @@ keywords = [
   "database",
 ]
 
-readme = 'README.md'
+readme = "README.md"
 packages = [
   { include = "unihan_db" },
 ]