Fix license

Author: fealone

setup.cfg

@@ -11,7 +11,7 @@ licence = file: LICENCE
 python_requires = >=3.7
 classifiers = 
   Development Status :: 2 - Pre-Alpha
-  License :: OSI Approved :: GNU LESSER GENERAL PUBLIC LICENSE V3
+  License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)
   Programming Language :: Python :: 3.7
   Programming Language :: Python :: 3.8
   Programming Language :: Python :: 3.9