Updated README.txt with the documentation URL

README.txt

@@ -1,5 +1,11 @@
 This is a pythonic binding for SFML 2, which supports Python 2 and 3.
-The current project page is https://github.com/bastienleonard/pysfml2-cython.
+This library allows you to write multimedia applications or games with
+a simple Python API.
+
+Go to the project page if you're looking for the source code,
+downloads or the bug tracker:
+https://github.com/bastienleonard/pysfml2-cython
 
 Please read doc/sphinx/source/introduction.rst for more information.
-You can also read the HTML documentation at http://bastien-leonard.alwaysdata.net/pysfml/doc/index.html, which is normally up-to-date.
+You can also read the generated HTML documentation at
+http://pysfml2-cython.readthedocs.org/