Remove newline from description field in setup.cfg

Try to fix this issue cookiecutter#1614

Info to fix find in:
* https://setuptools.pypa.io/en/latest/userguide/declarative_config.html?highlight=setup.cfg
* pypa/setuptools#1390 (reference)

setup.cfg

@@ -6,10 +6,7 @@ project_urls =
   CI: GitHub = https://github.com/cookiecutter/cookiecutter/actions
   Documentation = https://cookiecutter.readthedocs.io/
   Source Code = https://github.com/cookiecutter/cookiecutter
-description =
-    A command-line utility that creates projects from project
-    templates, e.g. creating a Python package project from a
-    Python package project template.
+description = A command-line utility that creates projects from project templates, e.g. creating a Python package project from a Python package project template.
 long_description = file: README.md
 long_description_content_type = text/markdown
 author = Audrey Feldroy