require-post-message-target-origin should ignore some cases

[2000yeshu]

This rule throws an error when using the postMessage method window.Worker but it shouldn't. For example,

this.worker = new Worker('/speedtest_worker.js');
this.worker.postMessage('some message');

It should ignore this case because there is no target origin parameter in the postmessage method of worker.

[2000yeshu]

I would love to fix this issue. You can assign this issue to me.

[sindresorhus]

Please include a code full example of the cases it should ignore.

[fisker]

Duplicate of #1396