Update pypi license

Author: JacksonMaxfield

setup.py

@@ -70,7 +70,7 @@
         "Topic :: Scientific/Engineering :: Visualization",
         "Topic :: Scientific/Engineering :: Information Analysis",
         "Topic :: Scientific/Engineering :: Bio-Informatics",
-        "License :: OSI Approved :: BSD License",
+        "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
         "Natural Language :: English",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",