[gimp/gimp-2-8] build/osx: update tag to build GIMP 2.8.20

[Kristian Rietveld <kristian src gnome org>]

commit cd6724a8e4e3e4c66d2b9ca86f1123d94fe55e07
Author: Kristian Rietveld <kris loopnest org>
Date:   Sun Feb 5 15:56:58 2017 +0100

    build/osx: update tag to build GIMP 2.8.20

 build/osx/gimp.modules |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/build/osx/gimp.modules b/build/osx/gimp.modules
index 9191e30..2141907 100644
--- a/build/osx/gimp.modules
+++ b/build/osx/gimp.modules
@@ -803,7 +803,7 @@
        <autotools id="gimp-2.8" autogen-sh="autogen.sh"
                autogenargs="--without-x --disable-gtk-doc --without-dbus --without-wmf --enable-binreloc 
--without-gs --without-gvfs --with-libcurl"
                skip-autogen="never">
-               <branch repo="git.gnome.org" module="gimp" revision="GIMP_2_8_18"
+               <branch repo="git.gnome.org" module="gimp" revision="GIMP_2_8_20"
                        checkoutdir="gimp-2.8" />
                <dependencies>
                        <dep package="libpng" />