6ef99a6b
--- a/Dockerfile
+++ b/Dockerfile
 FROM python:3
-ENV version=
-RUN pip install black$(version)
+ARG version
+ENV version=${version}
+RUN pip install black${version}
	FROM python:3		FROM python:3
	ENV version=

	RUN pip install black$(version)		ARG version
			ENV version=${version}

			RUN pip install black${version}