Adjust image width

Author: GaryGSC

README.md

@@ -2,8 +2,10 @@
 A GitHub Action for sending Slack notifications
 
 Sends messages that look like:
-![Message on Push](push.png)
-![Message on Pull Request](pr.png)
+
+<img src="https://github.com/byu-oit/github-action-slack/blob/master/push.png" width="500">
+
+<img src="https://github.com/byu-oit/github-action-slack/blob/master/pr.png" width="500">
 
 ## Setup
 Your Slack workplace will need a <img src="https://github.com/byu-oit/github-action-slack/blob/master/cancel.png" width="16" height="16"> (`:cancel:`) emoji. We've provided one in this repo.