title: RxSwift: Append elements to Observable<[_]>
body: <p>I have an array (<code>Observable&lt;[_]&gt;</code>) that is a datasource for a tableview. I want to be able to append new elements to it and update the tableview every time new elements are appended to the array. I can't find how to add new elements to <code>Observable&lt;[_]&gt;</code>.</p>