Use readme.md as PyPI description

Author: XVilka

setup.py

@@ -28,10 +28,16 @@
 else:
     raise RuntimeError("unexpected python major version")
 
+def readme():
+    with open('readme.md') as f:
+        return f.read()
+
 setup(
     name="python-idb",
     version="0.7.0",
     description="Pure Python parser for IDA Pro databases (.idb files)",
+    long_description=readme(),
+    long_description_content_type='text/markdown',
     author="Willi Ballenthin",
     author_email="willi.ballenthin@gmail.com",
     url="https://github.com/williballenthin/python-idb",