Add license-files field to pyproject.toml

Author: youtux

poetry.lock

@@ -5,6 +5,7 @@ description = "Factory Boy support for pytest."
 authors = [ { name = "Oleg Pidsadnyi", email= "oleg.pidsadnyi@gmail.com" } ]
 maintainers = [ { name = "Alessio Bogon", email = "778703+youtux@users.noreply.github.com" } ]
 license = "MIT"
+license-files = [ "LICENSE.md"]
 readme = "README.rst"
 
 classifiers = [