Whitespace change in a README.

README.HG

-
 The latest development version of SDL is available via Mercurial.
 Mercurial allows you to get up-to-the-minute fixes and enhancements;
 as a developer works on a source tree, you can use "hg" to mirror that
@@ -16,6 +15,7 @@ If you are building SDL via configure, you will need to run autogen.sh
 before running configure.
 
 There is a web interface to the subversion repository at:
+
 	http://hg.libsdl.org/SDL/
 
 There is an RSS feed available at that URL, for those that want to