Remove carriage returns in setup.py long_description

Mitigates pypa/setuptools#1440

Author: Harmon758

setup.py

@@ -11,7 +11,7 @@
 import smmap
 
 if os.path.exists("README.md"):
-    long_description = codecs.open('README.md', "r", "utf-8").read()
+    long_description = codecs.open('README.md', "r", "utf-8").read().replace('\r\n', '\n')
 else:
     long_description = "See https://github.com/gitpython-developers/smmap"