Code linting

[femtotrader]

Hello,

Just to let you know that ruff have found some lint errors. No a great deal

ruff check .
examples\indicators.py:5:41: F401 [*] `talipp.indicators.RogersSatchell` imported but unused
examples\readme_example.py:50:7: F541 [*] f-string without any placeholders
examples\readme_example.py:56:7: F541 [*] f-string without any placeholders
Found 3 errors.
[*] 3 fixable with the `--fix` option.

Kind regards