no-hooks-from-ancestor-modules does not catch when arrow function is used

[bretjb]

Caught this one earlier today. no-hooks-from-ancestor-modules rule does not appear to throw an error when arrow functions are used in the module.

module('big test', function (hooks) {
  module('group 1', () => {
    // this is not a linting error
    hooks.beforeEach(() => { ... });
  });

  module('group 2', function () {
    // this is a linting error
    hooks.beforeEach(() => { ... });
  });
});

[platinumazure]

Thanks @bretjb for the issue. I am able to reproduce.

Working on a fix now.