Updated atom to v1.5.1

Signed-off-by: Michael Käufl <dockerfiles@c.michael-kaeufl.de>
diff --git a/atom/Dockerfile b/atom/Dockerfile
index 35771b8..e1e7be5 100644
--- a/atom/Dockerfile
+++ b/atom/Dockerfile
@@ -40,7 +40,7 @@
 	--no-install-recommends \
 	&& rm -rf /var/lib/apt/lists/*
 
-ENV ATOM_VERSION 1.4.0
+ENV ATOM_VERSION 1.5.1
 
 # download the source
 RUN buildDeps=' \