improvement: update setup.cfg

Author: leafcoder

setup.cfg

@@ -1,21 +1,24 @@
 [metadata]
 name = django_covid19
 version = 0.4b1
-description = An django app of the covid-19 API in countries around the world, provinces and cities in China, and states in the USA. 
+description = A django app of covid-19 API in countries around the world, provinces and cities in China, and states in the USA.
 long_description = file: README.md
 long-description-content-type = text/markdown
 url = https://github.com/leafcoder/django-covid19
 author = leafcoder
 author_email = leafcoder@gmail.com
 license = MIT
+license_file = LICENSE
 keywords = python django covid19 2019-ncov app
 classifiers =
+    Development Status :: 5 - Production/Stable
     Environment :: Web Environment
     Framework :: Django
     Framework :: Django :: 2.2
     Framework :: Django :: 3.0
     Intended Audience :: Developers
     License :: OSI Approved :: MIT License
+    Natural Language :: Chinese (Simplified)
     Operating System :: OS Independent
     Programming Language :: Python
     Programming Language :: Python :: 3
@@ -25,6 +28,8 @@ classifiers =
     Programming Language :: Python :: 3.8
     Topic :: Internet :: WWW/HTTP
     Topic :: Internet :: WWW/HTTP :: Dynamic Content
+    Topic :: Software Development :: Libraries
+    Topic :: Software Development :: Libraries :: Python Modules
 
 [options]
 include_package_data = true