fix: fix markdown readme in setup.py

Author: untitaker

setup.py

@@ -2,14 +2,21 @@
 
 from setuptools import setup, find_packages
 
+# read the contents of your README file
+from os import path
+this_directory = path.abspath(path.dirname(__file__))
+with open(path.join(this_directory, 'README.md'), encoding='utf-8') as f:
+    long_description = f.read()
+
 setup(
     name="sentry-sdk",
     version="0.1.0-preview3",
     author="Sentry Team and Contributors",
     author_email="hello@getsentry.com",
     url="https://github.com/getsentry/sentry-sdk",
     description="Python client for Sentry (https://getsentry.com)",
-    long_description=__doc__,
+    long_description=long_description,
+    long_description_content_type='text/markdown',
     packages=find_packages(exclude=("tests", "tests.*")),
     zip_safe=False,
     license="BSD",