Upgrading to 2.15 and above results in 404 when used in webhook mode #743
Description
Problem Description
Updated the image to 2.15, noticed that the webhooks are not arriving and get a 404 instead. No changes were made except a move from 2.15.rc1 to 2.15
What is actually happening
It appears that the dependency updates are breaking.
What is the expected behavior
Webhooks process normally
Error output, if available
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Error</title>
</head>
<body>
<pre>Cannot POST /</pre>
</body>
</html>```
## Context
### Are you using the hosted instance of probot/settings or running your own?
Running my own
### If running your own instance, are you using it with github.com or GitHub Enterprise?
Github enterprise
#### Version of probot/settings
#### Version of GitHub Enterprise