vue/custom-event-name-casing forcing camelCase on vue2 code

[cain]

What rule do you want to change?
Removing rule from vue2 vue/custom-event-name-casing.

Official vue documentation recommends using kebab case for naming custom event names. https://vuejs.org/v2/guide/components-custom-events.html#Event-Names
"For these reasons, we recommend you always use kebab-case for event names."

Does this change cause the rule to produce more or fewer warnings?
Fewer

How will the change be implemented? (New option, new default behavior, etc.)?
Removing rule from plugin:vue/recommended and plugin:vue/essential

Please provide some example code that this change will affect:

$emit('somethingCool') // throws linting error

What does the rule currently do for this code?

What will the rule do after it's changed?

Additional context
version: 7.1

[cain]

See sandbox link: https://codesandbox.io/s/silly-framework-zb0uj?file=/src/App.vue:162-184

[ota-meshi]

If you are using vue2, we recommend always using kebab-case.
https://vuejs.org/v2/guide/components-custom-events.html#Event-Names

However, for another reason, we plan to remove vue/custom-event-name-casing rule from the configuration.

• vue/require-explicit-emits not picking up listed emits in different cases #1347
• camelCase events can be listened to in the kebab-case docs#656

[cain]

If you are using vue2, we recommend always using kebab-case.
https://vuejs.org/v2/guide/components-custom-events.html#Event-Names

That's the whole point of my issue @ota-meshi

Looking forward to the next release.