[gedit] gitignore: ignore /build/, not build/

[Sébastien Wilmet <swilmet src gnome org>]

commit 805374cb079c1dee1f2dcb7fc7aa7279b87e54e4
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Nov 11 04:17:35 2019 +0100

    gitignore: ignore /build/, not build/
    
    To ignore only the toplevel build/ directory, not all build/
    directories. For example there is already osx/build/.

 .gitignore | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitignore b/.gitignore
index 3d4333929..4ea31d47b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
-build/
+/build/
 __pycache__/