Update setup.py (#693)

Add long_description settings to setup.py to address `twine check` errors

Author: jamaalscarlett

setup.py

@@ -1,4 +1,11 @@
 #!/usr/bin/env python
 from setuptools import setup
+from pathlib import Path
 
-setup(use_scm_version={"version_scheme": "post-release"})
+this_directory = Path(__file__).parent
+long_description = (this_directory / "README.rst").read_text()
+setup(
+    long_description=long_description,
+    long_description_content_type='text/markdown',
+    use_scm_version={"version_scheme": "post-release"}
+)