[PATCH 1 of 3] README: link to readthedocs.org rather than python.org for documentation

[Thomas De Schampheleire]

# HG changeset patch
# User Thomas De Schampheleire <thomas.de.schampheleire at gmail.com>
# Date 1426366244 -3600
#      Sat Mar 14 21:50:44 2015 +0100
# Node ID 42db321baa410e0cbf91003750fafeec0e9e5cbf
# Parent  97af92113da02ebcd00de22d99348374a6182667
README: link to readthedocs.org rather than python.org for documentation

The documentation at readthedocs.org is up-to-date with the latest revision,
while python.org shows the latest release.

diff --git a/README.rst b/README.rst
--- a/README.rst
+++ b/README.rst
@@ -30,7 +30,7 @@
 The development repository is kept very stable and used in production by the
 developers - you can do the same.
 
-Please visit http://packages.python.org/Kallithea/installation.html for
+Please visit http://docs.kallithea-scm.org/en/latest/installation.html for
 more details.