Update license and language classifiers

Author: johmedr

pyproject.toml

@@ -12,8 +12,7 @@ authors = [{name = "Johan Medrano", email = "johan.medrano@ucl.ac.uk"}]
 requires-python = ">=3.9,<=3.12"
 classifiers = [
   "Development Status :: 3 - Alpha",
-  "License :: OSI Approved :: GPL2",
-  "Programming Language :: Python :: 3",
+  "License :: OSI Approved :: GNU General Public License v2 (GPLv2)",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",