Using parenthesis grouping instead of backslashs to improve readability

[DevOpsCraftsman]

Example:

rule = (
    Rule()
    .modules_that()
    .are_sub_modules_of("application")
    .should_not()
    .be_imported_by_modules_that()
    .are_sub_modules_of("domain")
)

This is compatible with black.

[zyskarch]

Thank you for your suggestion! I'll adapt the documentation/Readme accordingly.