title: Manually trigger IOptionsMonitor<>.OnChange
body: <p>In ASP.NET Core 2.1, I use IOptionsMonitor&lt;> and have it set up so I can successfully get events for when I change the appSettings.json file.  So this is working.</p>
  
  <p>What I want to do now is to manually change some values in my options, through code, and have that trigger all my monitors.  Is this possible?</p>