Papertrail alerts

[aericson]

Add to README instructions to setup Papertrail alerts.

Examples:

Name:Platform errors
Query:
"error code=H" OR "Error R" OR "Error L"

Name:Request timeout
Query:
code=H12

Name:Worker errors
Query:
"app/worker" AND ERROR/MainProcess

[filipeximenes]

The same applies to Papertrail

[aericson]

ooops, it was supposed to be papertrail. No idea where I got paperclip from xD

[hugobessa]

We're not supporting papertrail anymore as Render.com has its own logs tool.