[pitivi] gitignore: Ignore all .flatpak-build directories

[Thibault Saunier <tsaunier src gnome org>]

commit b248730db0e3a874823168dccfedd7d0e37c756f
Author: Thibault Saunier <thibault saunier osg samsung com>
Date:   Thu Jan 5 21:16:11 2017 -0300

    gitignore: Ignore all .flatpak-build directories
    
    Differential Revision: https://phabricator.freedesktop.org/D1589

 .gitignore |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 8b5d15a..86cb2f2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,6 @@ help/index.cache
 
 # xdg-app/flatpak
 .bashrc
-build/flatpak/.flatpak-builder
+*.flatpak-builder/
 build/flatpak/Pitivi.*.json
 build/devel/