Use twine check instead of setup.py check

requirements/docs.txt

@@ -2,7 +2,8 @@
 Sphinx>=1.7.0
 sphinx_rtd_theme>=0.2.4
 Pillow>=4.3.0
-readme_renderer>=17.2
+readme_renderer[md]>=24.0
+twine>=1.12.1
 
 Django>=2.0
 djangorestframework_camel_case>=0.2.0