Fix ref to README.md in setup.py

setup.py

diff --git a/setup.py b/setup.py
index 698afd7..293c5b6 100644
--- a/setup.py
+++ b/setup.py
@@ -43,7 +43,7 @@
 AUTHOR = 'Apache Software Foundation'
 AUTHOR_EMAIL = 'dev@cloudstack.apache.org'
 DESC = "EC2 compatibility interface for Apache Cloudstack"
-LONG_DESC = read_file('README.rst')
+LONG_DESC = read_file('README.md')
 REQUIRES = [
     'Flask-SQLAlchemy', 'flask', 'requests', 'alembic'
 ]