Updated to include the optional output of any new entry to the termin…

[adammpkins]

…al for consumption by other terminal apps.

Here are some key points to include in your description:

• What is this new code intended to do? Adds a config option to output any new entries to the terminal after submission.
• Are there any related issues? No
• What is the motivation for this change? Allows for other terminal applications to ingest the output.
• What is an example of usage, or changes to config files? (if applicable) - I'm building an integration where any of my journal entries get submitted to notion automatically in my journal there. It's hard/impossible to get the most-recently created (not the most recently dated) entry in order to transmit the correct entry when jrnl is run in append mode. Outputting it to the terminal should make it pipable.
  Issue 1871

Checklist

• I have read the contributing doc.
• I have included a link to the relevant issue number.
• I have checked to ensure there aren't other open pull requests
  for the same issue.
• I have written new tests for these changes, as needed.