[gimp] Fix the location of the upstream libmypaint repository

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit 87581cb309586614e268c5d5ecf430cd5d84da0e
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Tue Mar 31 01:05:35 2015 +0300

    Fix the location of the upstream libmypaint repository

 INSTALL.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/INSTALL.in b/INSTALL.in
index 661e1ae..6e80efc 100644
--- a/INSTALL.in
+++ b/INSTALL.in
@@ -83,7 +83,7 @@ header files installed.
      compiled with GEGL support: `scons enable_gegl=true install`.
      Brushlib repository is hosted at:
 
-        https://gitorious.org/mypaint/libmypaint/
+        https://github.com/mypaint/libmypaint
 
  11. You may want to install other third party libraries or programs
      that are needed for some of the available plug-ins. We recommend