remove duplicated license information

Author: maxbachmann

setup.cfg

@@ -15,7 +15,6 @@ classifiers =
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12
     Programming Language :: Python :: 3.13
-    License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)
 keywords = string, Levenshtein, comparison, edit-distance
 
 [options]