no-describe-variables does not work if spec definition is an arrow function

[plutosimple]

Describe the bug
The rule 'no-describe-variables' does not work if spec definition is an arrow function.

// Works - error thrown
describe('', function() {
let sampleVar;
}

// Does not work - no error
describe('',() => {
let sampleVar;
}

To Reproduce

1. Turn the rule on
2. set a variable under a describe.
3. The describe should use an arrow function for its spec definition
4. Run the linter.

Expected behaviour
An error should be shown as 'let sampleVar' is a variable in the describe

Context

• Node.js version: 10.18.0
• eslint-plugin-jasmine version: 4.1.0
• eslint version: 6.8.0
• Operating system: MacOS Catalina

[lrdiv]

Will this be in an upcoming release?