Remove incorrect arguments.

Treat the top-level directory as the distribution root.

Author: m-banther

setup.py

@@ -10,8 +10,6 @@
 # The same modules should appear in the requirements.txt file as given below.
 setuptools.setup(
     name='lib_xassert',
-    package_dir={'': 'lib/python'},
-    packages=setuptools.find_packages(where="lib/python"),
     install_requires=[
         "flake8~=3.8",
     ],