Update setup.py

Change license

Author: g1ca

setup.py

@@ -18,7 +18,7 @@
     test_suite='tests/tests.py',
     classifiers=[
         'Programming Language :: Python :: 3',
-        'License :: OSI Approved :: MIT License',
+        'License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)',
         'Operating System :: OS Independent',
     ],
     python_requires='>=3.8',