[gtk] rename CODE-OWNERS to CODEOWNERS

[Timm Bäder <baedert src gnome org>]

commit 1e2c03beee543f4988d707dc0c7b9629abebfbb6
Author: Timm Bäder <mail baedert org>
Date:   Wed Jan 8 20:59:11 2020 +0100

    rename CODE-OWNERS to CODEOWNERS
    
    gitlab reads the new filename but not the old one.

 CONTRIBUTING.md                  | 2 +-
 docs/{CODE-OWNERS => CODEOWNERS} | 0
 2 files changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4743e81f07..713c259190 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -174,7 +174,7 @@ maintainers review your contribution.
 
 Each contribution is reviewed by the core developers of the GTK project.
 
-The [CODE-OWNERS](./docs/CODE-OWNERS) document contains the list of core
+The [CODEOWNERS](./docs/CODEOWNERS) document contains the list of core
 contributors to GTK and the areas for which they are responsible; you
 should ensure to receive their review and signoff on your changes.
 
diff --git a/docs/CODE-OWNERS b/docs/CODEOWNERS
similarity index 100%
rename from docs/CODE-OWNERS
rename to docs/CODEOWNERS