[gjs: 1/6] linter: Bump JS version to ES2019

[Philip Chimento <pchimento src gnome org>]

commit 805d91ee0149b56056f968014c3898014b948e6e
Author: Philip Chimento <philip chimento gmail com>
Date:   Sat Mar 21 12:35:52 2020 -0700

    linter: Bump JS version to ES2019
    
    We support these things now.

 .eslintrc.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.eslintrc.yml b/.eslintrc.yml
index 3af41050..fec07a40 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -226,4 +226,4 @@ globals:
   printerr: readonly
   window: readonly
 parserOptions:
-  ecmaVersion: 2017
+  ecmaVersion: 2019