EmailTask: accept msg_plain, email_to_cc and email_to_bcc

[joelluijmes]

Summary

Expends possibilities of EmailTask by accepting the following parameters: msg_plain, email_to_cc and email_to_bcc

• msg_plain: allows to add plain text version of email
• email_to_cc: additional addresses to put in CC
• email_to_bcc: additional addresses to put in BCC

Changes

Additional parameters.

Importance

More flexibility :)

Checklist

This PR:

• adds new tests (if appropriate)
• adds a change file in the changes/ directory (if appropriate)
• updates docstrings for any new functions or function arguments, including docs/outline.toml for API reference docs (if appropriate)

[codecov]

Codecov Report

Merging #4157 (1adf73f) into master (5d086e3) will decrease coverage by 0.01%.
The diff coverage is n/a.

[zanieb]

Hey @joelluijmes, this is a nice upgrade for this task! Can you confirm that switching to this different email API isn't going to break anything for existing users?

[joelluijmes]

Hey @joelluijmes, this is a nice upgrade for this task! Can you confirm that switching to this different email API isn't going to break anything for existing users?

Yes should be backwards compatible. As in, didn’t rename the param or changed the order :)

[zanieb]

Hey @joelluijmes, this is a nice upgrade for this task! Can you confirm that switching to this different email API isn't going to break anything for existing users?

Yes should be backwards compatible. As in, didn’t rename the param or changed the order :)

My concern is that the appearance of people's emails will change since the content is being specified differently now and I don't want to break anyone's flows using email tasks.

[joelluijmes]

My concern is that the appearance of people's emails will change since the content is being specified differently now and I don't want to break anyone's flows using email tasks.

Understandably, but fortunately this doesn't change anything. Only specifiying the msg (add_alternative) with html yields a html email 👍

[zanieb]

If you merge master in you'll fix the codecov error. You'll need to run black on whatever file it's complaining about. Otherwise this LGTM, I like the rephrased comment 👍