Added screenshot of triggered alert on Android. Replaced screenshot o…

…f resolved alert in webapp with one that shows the change event, as those seem to have a short retention period.

Readme.md

@@ -243,11 +243,11 @@ Sep 23 01:21:11 dryer systemd[1]: Started DryerDuty.
     The dryer has finished a load of laundry.
     ```
 
+    <p align="center"><img src=".github/images/triggered-alert.png" alt="Alert in the PagerDuty Android app" height="843" /></p>
 1. When the dryer door is opened after it finishes a load, this program will automatically resolve the previously created Alert. You can also manually resolve the Alert from the PagerDuty web or mobile apps.
 
     ![Resolved incident in the PagerDuty webapp](.github/images/resolved-alert.png)
 
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 ## References
 - [command-tab/brewbot (Collin Allen)](https://github.com/command-tab/brewbot)