Dynamically build package description

This allows it to include missing link to release notes and to
avoid problematic lines in README that PyPI doesn't like.

setup.py

@@ -21,6 +21,7 @@
 
 from pootle import __version__
 from pootle.constants import DJANGO_MINIMUM_REQUIRED_VERSION
+from pootle.core.utils.version import get_main_version
 
 
 def check_pep440_versions():
@@ -267,6 +268,26 @@ def get_check_description(name, filterfunc):
         print("Checks templates written to %r" % (filename))
 
 
+def parse_long_description(filename):
+    readme_lines = open(
+        os.path.join(os.path.dirname(__file__), filename)
+    ).read().split("\n")
+    pootle = "Pootle"
+    notes = "Release notes"
+    initial_title = [  # PyPI doesn't like |logo|
+        pootle,
+        "="*len(pootle)
+    ]
+    release_notes = [  # Missing in README.
+        notes,
+        "-"*len(notes),
+        "",
+        ("- `Release notes <http://docs.translatehouse.org/projects/pootle/"
+         "en/latest/releases/%s.html>`_") % get_main_version()
+    ]
+    return "\n".join(initial_title + readme_lines[2:-4] + release_notes)
+
+
 check_pep440_versions()
 
 
@@ -308,9 +329,7 @@ def get_check_description(name, filterfunc):
     version=__version__,
 
     description="An online collaborative localization tool.",
-    long_description=open(
-        os.path.join(os.path.dirname(__file__), 'README.rst')
-    ).read(),
+    long_description=parse_long_description('README.rst'),
 
     author="Translate",
     author_email="dev@translate.org.za",