Fix a few warnings with setup.cfg and add the zip_safe option

setup.cfg

@@ -7,7 +7,7 @@ description = A markdown-like text editor for planning and writing novels
 url = https://novelwriter.io
 long_description = file: setup/description_pypi.md
 long_description_content_type = text/markdown
-license_file = LICENSE.md
+license_files = LICENSE.md
 license = GNU General Public License v3
 classifiers =
     Programming Language :: Python :: 3 :: Only
@@ -29,9 +29,10 @@ project_urls =
     Source Code = https://github.com/vkbo/novelWriter
 
 [options]
+zip_safe = False
 python_requires = >=3.7
 include_package_data = True
-packages = find:
+packages = find_namespace:
 install_requires =
     pyqt5>=5.10
     lxml>=4.2.0