[setup.py] add Production, Py3.7,Py3.8 setup.py classifiers

Author: chrissimpkins

setup.py

@@ -58,12 +58,14 @@ def version_read():
     keywords="",
     include_package_data=True,
     classifiers=[
-        "Development Status :: 4 - Beta",
+        "Development Status :: 5 - Production/Stable",
         "Natural Language :: English",
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
     ],
 )