[gnome-commander] Fixing Dockerfile line break - again

[Uwe Scholz <uwescholz src gnome org>]

commit 530eaa97a3d789b49b0011eb83aa9a40b28d6e98
Author: Uwe Scholz <u scholz83 gmx de>
Date:   Sun Jan 27 19:04:03 2019 +0100

    Fixing Dockerfile line break - again

 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Dockerfile b/Dockerfile
index af4aef5f..4ae1e08f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ MAINTAINER Uwe Scholz <u scholz83 gmx de>
 ENV GCMD_PATH /gnome-commander
 
 RUN \
-  sed -Ei 's/^# deb-src /deb-src /' /etc/apt/sources.list \
+  sed -Ei 's/^# deb-src /deb-src /' /etc/apt/sources.list && \
   apt-get update -qq && \
   apt-get install -yq sudo && \
   echo $LANG && \