[frogr] [OSX] Updated README file, adding mention to 2 meta bootstrap modules

[Mario Sanchez Prada <msanchez src gnome org>]

commit b9a5964b03512b133915271046ddbc16833afe40
Author: Mario Sanchez Prada <msanchez gnome org>
Date:   Sun Sep 7 22:42:59 2014 +0100

    [OSX] Updated README file, adding mention to 2 meta bootstrap modules

 osx/README |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/osx/README b/osx/README
index da905a0..292a6b7 100644
--- a/osx/README
+++ b/osx/README
@@ -53,6 +53,8 @@ environment variable JHB=frogr.
 Finally we are ready to built frogr:
 
   $ JHB=frogr jhbuild bootstrap
+  $ JHB=frogr jhbuild build meta-gtk-osx-bootstrap
+  $ JHB=frogr jhbuild build meta-gtk-osx-core
   $ JHB=frogr jhbuild build frogr
 
 Note that it's perfectly possible that something might fail during the built,