Update setup.cfg

Author: marvinfriede

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = squarer
-version = attr: squarer.__version__
+version = attr: squarer.__version__.__version__
 long_description = file: README.md
 long_description_content_type = text/markdown
 author = "Marvin Friede"
@@ -24,6 +24,7 @@ packages = find:
 install_requires =
     numpy
 python_requires = >=3.7
+include_package_data = True
 package_dir =
     =src