[gnome-builder] defaults: add some sensible defaults for rust

[Christian Hergert <chergert src gnome org>]

commit 49f1bb8ef27fb90cf632db3304a67f86ea0eea91
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jan 30 17:41:21 2018 -0800

    defaults: add some sensible defaults for rust

 src/libide/files/defaults.ini | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/src/libide/files/defaults.ini b/src/libide/files/defaults.ini
index 10afd71d7..2c470afcb 100644
--- a/src/libide/files/defaults.ini
+++ b/src/libide/files/defaults.ini
@@ -7,7 +7,7 @@
 # "all languages" default value will get that setting overridden. A potential
 # alternative is to layer backends, which is out of scope at the moment.
 [global]
-version = 5
+version = 6
 
 [automake]
 insert-spaces-instead-of-tabs = false
@@ -97,6 +97,12 @@ tab-width = 2
 insert-matching-brace = true
 overwrite-braces = true
 
+[rust]
+insert-spaces-instead-of-tabs = true
+tab-width = 4
+insert-matching-brace = true
+overwrite-braces = true
+
 [vala]
 insert-spaces-instead-of-tabs = true
 tab-width = 4