[polari] lint: Sync with gjs

[Florian Müllner <fmuellner src gnome org>]

commit bda3dd5db4faa3da2f28c5a713f853d8677b7a55
Author: Florian Müllner <fmuellner gnome org>
Date:   Sun Apr 5 03:24:23 2020 +0200

    lint: Sync with gjs
    
    Nothing ground-breaking, just relaxing an existinig rule and
    a standard bump.
    
    https://gitlab.gnome.org/GNOME/polari/-/merge_requests/155

 lint/eslintrc-gjs.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/lint/eslintrc-gjs.yml b/lint/eslintrc-gjs.yml
index 53d5fbd3..fec07a40 100644
--- a/lint/eslintrc-gjs.yml
+++ b/lint/eslintrc-gjs.yml
@@ -87,6 +87,7 @@ rules:
     - error
     - all
     - conditionalAssign: false
+      nestedBinaryExpressions: false
       returnAssign: false
   no-implicit-coercion:
     - error
@@ -225,4 +226,4 @@ globals:
   printerr: readonly
   window: readonly
 parserOptions:
-  ecmaVersion: 2017
+  ecmaVersion: 2019