[mousetrap/gnome3-wip] Update README to build with Python 3

[Heidi Ellis <heidiellis src gnome org>]

commit 3745fcd2c21dc225a2f71800868619cb837462dc
Author: Tyler Redzko <tredzko hotmail com>
Date:   Thu Feb 5 13:42:45 2015 -0500

    Update README to build with Python 3
    
    Authors: tredzko, SClawz, Tom Manolakis,
         Collaj, max12187
    
    autogen.sh by default attached to Python 2.7. We updated the README file
    to include directions on how to specify which python version to use.

 README.md |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/README.md b/README.md
index b0c34f2..bcaf903 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,9 @@ License: GPL v2.0 (see LICENSE)
 ### Using `autotools`
 
     cd mousetrap
+    # For python3: 
+    PYTHON=$(which python3) ./autogen.sh # On Fedora, add --prefix=/usr
+    # For python2:
     ./autogen.sh # On Fedora, add --prefix=/usr
     make
     sudo make install