markdown fix in readme

[Andrew Beyer <beyer andrew gmail com>]

FYI, there's some unescaped markdown in the README that throws off formatter:

diff --git a/README b/README
index e603f11..7f541c3 100644
--- a/README
+++ b/README
@@ -39,7 +39,7 @@ or if you're on Ubuntu, instead try:
  * `python setup.py install --prefix=/usr`

 ...but you should probably just get a RPM/deb/installer instead, depending on
-your system. Meld packages are available for just about every *nix
+your system. Meld packages are available for just about every \*nix
 distribution.

 For Windows users, MSIs are available from the Meld home page.