healthchecks / healthchecks / 29913327451

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Fix the email integration to sanitize long lines in .eml attachments

The problem:

* User pings a check by sending an email. The email uses
  "Content-Transfer-Encoding: 8bit", and the email body is all one
  very long line (thousands of characters)
* Healthchecks accepts the email message
* After period of no pings, the check goes down and `sendalerts`
  sends a notification. The email integration includes the last
  received email message as a message/rfc822 attachment. It leaves
  the very long lines in the attachment as-is.
* A SMTP server downstream rejects the email (line too long).

The fix: call set_content(get_content()) on the attachment (or on
each of its parts if it is a multipart message). This causes python
to select an optimal content-transfer-encoding and wrap the lines.

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