[gnome-shell] lint: Enforce arrow notation

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 5f77cdb0b96dc0c69ff05e53c1d5d956c6972b6f
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Jan 28 01:39:54 2019 +0100

    lint: Enforce arrow notation
    
    We replaced all Lang.bind() calls with arrow functions or the standardized
    Function.prototype.bind(), at least for the former eslint has some options
    to ensure that the old custom doesn't sneak back in.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/609

 lint/eslintrc-shell.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/lint/eslintrc-shell.json b/lint/eslintrc-shell.json
index f2524a6df..c5bed8690 100644
--- a/lint/eslintrc-shell.json
+++ b/lint/eslintrc-shell.json
@@ -3,7 +3,8 @@
         "object-curly-spacing": [
             "error",
             "always"
-        ]
+        ],
+        "prefer-arrow-callback": "error"
     },
 
     "overrides": [