Update setup.py to use README for long_description

Author: djhoese

README.rst

@@ -7,6 +7,10 @@ The aggdraw module
 
 A high-quality graphics engine for PIL, based on Maxim Shemanarev's
 Anti-Grain Geometry library (from http://antigrain.com).
+The aggdraw module implements the basic WCK 2D Drawing Interface on
+top of the AGG library. This library provides high-quality drawing,
+with anti-aliasing and alpha compositing, while being fully compatible
+with the WCK renderer.
 
 The necessary AGG sources are included in the aggdraw source kit.
 

setup.py

@@ -24,15 +24,7 @@
 VERSION = "1.4.0"
 
 SUMMARY = "High quality drawing interface for PIL."
-
-DESCRIPTION = """\
-
-The aggdraw module implements the basic WCK 2D Drawing Interface on
-top of the AGG library. This library provides high-quality drawing,
-with anti-aliasing and alpha compositing, while being fully compatible
-with the WCK renderer.
-
-"""
+README = open("README.rst", "r").read()
 
 
 def is_platform_mac():
@@ -159,9 +151,10 @@ def _get_freetype_with_pkgconfig():
         "Programming Language :: Python :: Free Threading :: 1 - Unstable",
         ],
     description=SUMMARY,
+    long_description=README,
+    long_description_content_type="text/x-rst",
     download_url="http://www.effbot.org/downloads#aggdraw",
     license="Python (MIT style)",
-    long_description=DESCRIPTION.strip(),
     url="https://github.com/pytroll/aggdraw",
     ext_modules=[
         Extension("aggdraw", ["aggdraw.cxx"] + sources,