Document XREAD of last message (+)

[gerzse]

Pull Request check-list

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• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
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Description of change

Issue #3155

XREAD now supports reading the last message in the stream, with the + special Id. The code already supports this, so just add some documentation to an existing Jupyter notebook.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.81%. Comparing base (2f88840) to head (433eed8).
Report is 19 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3188      +/-   ##
==========================================
- Coverage   91.84%   91.81%   -0.04%     
==========================================
  Files         128      128              
  Lines       33232    33328      +96     
==========================================
+ Hits        30523    30600      +77     
- Misses       2709     2728      +19     

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[earonesty]

lgtm

[vladvildanov]

@gerzse Is there a test case that covers this?

[gerzse]

@gerzse Is there a test case that covers this?

@vladvildanov Not an explicit unit test. The Jupyter notebook that I updated is "alive", in the sense that it can be executed, so it is sort of a proof that this works. I would not add unit tests for this, because it would test the server more than the client, I think.