Inject readme.md to long_description so it will show up on the pypi project page. (#482)

* Inject readme.md to long_description so it will show up on the pypi project page.

See: https://packaging.python.org/guides/making-a-pypi-friendly-readme/

Signed-off-by: Asher Foa <[email protected]>

Author: asherf

setup.py

@@ -1,14 +1,22 @@
 from setuptools import setup
+import sys
+from os import path
+
+if sys.version_info >= (2, 7):
+    with open(path.join(path.abspath(path.dirname(__file__)), 'README.md')) as f:
+        long_description = f.read()
+else: # Assuming we don't run setup in order to publish under python 2.6
+    long_description = "NA"
+
 
 setup(
     name="prometheus_client",
     version="0.7.1",
     author="Brian Brazil",
     author_email="[email protected]",
     description="Python client for the Prometheus monitoring system.",
-    long_description=(
-        "See https://github.com/prometheus/client_python/blob/master/README.md"
-        " for documentation."),
+    long_description=long_description,
+    long_description_content_type='text/markdown',
     license="Apache Software License 2.0",
     keywords="prometheus monitoring instrumentation client",
     url="https://github.com/prometheus/client_python",