Update setup.py

Author: mattmanley

setup.py

@@ -27,6 +27,7 @@ def get_version(rel_path):
       version=version,
       description="A Python API wrapper for MapRoulette",
       license="Apache License 2.0",
+      long_description_content_type='text/markdown'
       long_description=long_description,
       url="https://github.com/osmlab/maproulette-python-client",
       packages=find_packages(exclude=["tests", "examples"]),