Allow pip to pick up the license

Author: Matt Pryor

setup.cfg

@@ -6,7 +6,7 @@ long_description_content_type = text/markdown
 author = Matt Pryor
 author_email = matt@stackhpc.com
 url = https://github.com/stackhpc/pyhelm3
-
+license_files = LICENSE
 
 [options]
 zip_safe = False