docformatter removes blank line after last section in docstrings

Issue Summary

If a docstring has a summary and a description that consists of at least one section, then there should be a blank line between the last line of the section and the the final """ of the docstring.

Example

Given the class SomeClass below, docformatter will remove the blank line at the end of the class dosctring, after the "Methods" section. In contrast, pydocstyle will throw a D413 error if that blank line is removed: D413: Missing blank line after last section ('Methods').

Is it possible to setup docformatter to respect D413?

class SomeClass:
    """Summary.

    Methods:
        method_1
        method_2
        method_3

    """

    def __init__(self):
        """Summary.

        Details about this thing that does nothing.
        """
        pass

Reproduce the SomeClass docstring example and inspect how docformatter handles the final section blank line; compare the result with pydocstyle's D413 expectation. Done means docformatter preserves the blank line after the last section while retaining existing formatting behavior.