[gnome-builder] git: update gitignore for appdata

[Christian Hergert <chergert src gnome org>]

commit b552ce8855b198307631b39d650cea1d7069c83c
Author: Christian Hergert <christian hergert me>
Date:   Wed Dec 31 22:21:01 2014 -0800

    git: update gitignore for appdata

 data/appdata/.gitignore |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/appdata/.gitignore b/data/appdata/.gitignore
new file mode 100644
index 0000000..562eea8
--- /dev/null
+++ b/data/appdata/.gitignore
@@ -0,0 +1 @@
+org.gnome.Builder.appdata.valid