[librsvg/alatiera/rustfmt-docs] Update CONTRIBUTING.md

[Federico Mena Quintero <federico src gnome org>]

commit 49fd39b65535c4ee49441d8ebf0421721558b8dd
Author: Federico Mena Quintero <federico mena gmail com>
Date:   Sat Sep 15 01:07:53 2018 +0000

    Update CONTRIBUTING.md

 CONTRIBUTING.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ac01e65a..45a4bd26 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -162,7 +162,7 @@ of CI pipelines will fail:
     `cargo fmt --all -- --check`
 
 ***Installing rustfmt*** As of 2018/Sep, our continuous integration
-pipeline assumes the version of rustfmt that is distributed though the
+pipeline assumes the version of rustfmt that is distributed through the
 stable channel of [rustup](rustup.rs).  You can install it with
 
 ```