fix classifiers for package release

Author: wojtekwanczyk

setup.py

@@ -24,8 +24,8 @@
     url="https://github.com/wojtekwanczyk/easy_manage",
     packages=setuptools.find_packages(),
     classifiers=[
-        "Programming Language :: Python :: 3.6.8",
-        "License :: OSI Approved :: MIT License",
+        "Programming Language :: Python :: 3",
+        "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
         "Operating System :: OS Independent",
     ],
     entry_points={