Eslint-plugin-vue: vue 2.3+ v-bind support modifier async

[stevieyu]

Tell us about your environment

• ESLint Version: 4
• eslint-plugin-vue Version: 3.7
• Node Version: 10

Please show your full configuration:
notice: 'v-bind' directives don't support the modifier 'async'
but vue support .sync
link: https://vuejs.org/v2/guide/components-custom-events.html#sync-Modifier

What did you do? Please include the actual source code causing the issue.

What did you expect to happen?

What actually happened? Please include the actual, raw output from ESLint.

[michalsnik]

Hey @stevieyu ! The sync modifier is being supported: https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/valid-v-bind.js#L18

I tested it in a second, and I can't see any errors. Please try newer version of eslint-plugin-vue, current one is 4.7.0. If that doesn't help - feel free to reopen the issue and update code examples, as currently I can't see any code above ☝️

[YuJingGuo]

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