Avoid subfolders inside dist/ (#57)

Related: pypa/gh-action-pypi-publish#193

Author: ssbarnea

tox.ini

@@ -65,7 +65,7 @@ commands =
       --outdir {toxinidir}/dist/ \
       {toxinidir}
     sh -c "python -m twine check --strict {toxinidir}/dist/*"
-    pip install --constraint=.config/requirements.txt --target=dist/test '.[lock,test,docs]'
+    pip install --constraint=.config/requirements.txt --target=.tox/dist '.[lock,test,docs]'
 
 [testenv:docs]
 description = Builds docs