fix stray whitespace in setup.py

Author: Technologicat

setup.py

@@ -95,7 +95,7 @@
         "Development Status :: 4 - Beta",
         "Environment :: Console",
         "Intended Audience :: Developers",
-        "License :: OSI Approved ::  GNU General Public License v2 (GPLv2)",
+        "License :: OSI Approved :: GNU General Public License v2 (GPLv2)",
         "Operating System :: POSIX :: Linux",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",