Bump es version

sebmarkbage · sebmarkbage · commit 4058e5da3890 · 2020-11-16T23:16:17.000-05:00
We leave async function in here which are newer than ES2015.
diff --git a/scripts/rollup/validate/eslintrc.esm.js b/scripts/rollup/validate/eslintrc.esm.js
@@ -45,7 +45,7 @@ module.exports = {
     jest: true,
   },
   parserOptions: {
-    ecmaVersion: 2015,
+    ecmaVersion: 2017,
     sourceType: 'module',
   },
   rules: {
