Move from deprecated MAINTAINER to LABEL maintainer=...

See https://docs.docker.com/engine/reference/builder/#maintainer-deprecated

examples/nginx-centos7/Dockerfile

@@ -4,7 +4,7 @@
 FROM centos:centos7
 
 # Here you can specify the maintainer for the image that you're building
-MAINTAINER Your Name <your.name@example.com>
+LABEL maintainer="Your Name <your.name@example.com>"
 
 # Export an environment variable that provides information about the application version.
 # Replace this with the version for your application.

pkg/create/templates/docker.go

@@ -1,12 +1,11 @@
 package templates
 
 // Dockerfile is a default Dockerfile laid down by s2i create
-const Dockerfile = `
-# {{.ImageName}}
+const Dockerfile = `# {{.ImageName}}
 FROM openshift/base-centos7
 
 # TODO: Put the maintainer name in the image metadata
-# MAINTAINER Your Name <your@email.com>
+# LABEL maintainer="Your Name <your@email.com>"
 
 # TODO: Rename the builder environment variable to inform users about application you provide them
 # ENV BUILDER_VERSION 1.0