Split out the --ignore-property-decorators to allow ignore setter only

[chrisbeardy]

Describe the feature you'd like

Currently the -P, --ignore-property-decorators option ignores methods with property setter/getter decorators.
I (and potentially others) often just document the getter as IDEs like PyCharm will use the getter documentation for the setter too. This prevents the need to duplicate docstrings across the getter and setter.

It would be great if there was an option that allowed to just ignore the the setter only on a property.

[econchick]

Hey @chrisbeardy - sorry for the delay! Thank you for the suggestion. I merged in #74 that added -S/--ignore-setters that will be released in 1.4.0 (hopefully uploaded later tonight).