expect-matcher doesn't work correctly inside arrow function expression

[asapach]

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
expect-matcher rule doesn't detect the missing matcher inside arrow function expression:

it("test", () => expect("something"))

If the current behavior is a bug, please provide the steps to reproduce.

parserOptions:
  ecmaVersion: 6
plugins:
  - jasmine
env:
  jasmine: true
rules:
  jasmine/expect-matcher: 2

What is the expected behavior?
The expected error message is:

Expect must have a corresponding matcher call. (jasmine/expect-matcher)

It does work correctly for statement block though:

it("test", () => {
  expect("something"))
}

And when the matcher is not being called:

it("test", () => expect("something").toBe)

Please mention your node.js, eslint-plugin-jasmine and operating system version.
Windows 10 x64
Node v8.14.0
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