Fix classifiers license

Author: krukas

pyproject.toml

@@ -9,7 +9,7 @@ classifiers = [
     "Environment :: Web Environment",
     "Framework :: Django",
     "Intended Audience :: Developers",
-    "License :: OSI Approved :: GPL3 License",
+    "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",