Enable flake8 log formatting rules

[samdoran]

The cost of computing these particular log messages is low, but it's a good idea to get in the habit of deferring the formatting.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
command_line_assistant/handlers.py	0.00%	3 Missing ⚠️

Files with missing lines	Coverage Δ
command_line_assistant/handlers.py	0.00% <0.00%> (ø)

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