[gnome-builder] update .gitignore

[Christian Hergert <chergert src gnome org>]

commit cdbd387a99b5666940dae307c1691f5cf9f5abe9
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jun 7 14:13:16 2017 -0700

    update .gitignore

 .gitignore |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 1831059..3c6ff9e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
-_build
+build
 .flatpak-builder
 *.swp
 *~