[gnome-commander] noop: Use label instead of maintainer keyword in Dockerfile

[Uwe Scholz <uwescholz src gnome org>]

commit a169a17bc037293fead12a4793011191856b56e1
Author: Uwe Scholz <u scholz83 gmx de>
Date:   Mon Jan 6 15:00:52 2020 +0100

    noop: Use label instead of maintainer keyword in Dockerfile

 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Dockerfile b/Dockerfile
index 3860887a..1c66e702 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 # This is a Docker image for building gnome-commander
 FROM ubuntu:18.04
-MAINTAINER Uwe Scholz <u scholz83 gmx de>
+LABEL maintainer="Uwe Scholz <u scholz83 gmx de>"
 
 ENV GCMD_PATH /gnome-commander