Remove finalize_options override from goodpractices

This is not required in latest versions of `setuptools`, and
`self.test_args` is a read-only attribute in some of the
versions of the 18.X series.

Fix #1134

doc/en/goodpractises.rst

@@ -276,11 +276,6 @@ get started with setuptools integration::
             TestCommand.initialize_options(self)
             self.pytest_args = []
 
-        def finalize_options(self):
-            TestCommand.finalize_options(self)
-            self.test_args = []
-            self.test_suite = True
-
         def run_tests(self):
             #import here, cause outside the eggs aren't loaded
             import pytest