[gnome-shell] lint: Sync configuration with gjs

[Florian Müllner <fmuellner src gnome org>]

commit 53e8285cf03b08fef16de5958fd110733b11cf9b
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Mar 25 22:15:26 2020 +0100

    lint: Sync configuration with gjs
    
    Nothing big or scary, just a bump in the standard version which
    allows us to use shiny things without eslint complaining :-)

 lint/eslintrc-gjs.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/lint/eslintrc-gjs.yml b/lint/eslintrc-gjs.yml
index 3af4105071..fec07a4095 100644
--- a/lint/eslintrc-gjs.yml
+++ b/lint/eslintrc-gjs.yml
@@ -226,4 +226,4 @@ globals:
   printerr: readonly
   window: readonly
 parserOptions:
-  ecmaVersion: 2017
+  ecmaVersion: 2019