title: How to change thread using combine Publisher?
body: <p>I am using Combine and SwiftUI to do some async stuff, the point is that I don't know how to receive the response from the asynchronous operation in the main thread. The <a href="https://developer.apple.com/documentation/combine/publisher/3204743-receive" rel="noreferrer">apple doc</a> says that it can be used the RunLoop.main, but currently in Swift 5.0 it isn't a Scheduler. So any ideas about this?</p>
  
  <p>I have tried to use as per apple doc, but no luck.</p>
  
  <pre class="lang-swift prettyprint-override"><code>anyPublisher
      .receiveOn(on: RunLoop.main)
  </code></pre>