lib/facter: FIX docker Facts

lib/facter/docker.rb

@@ -69,7 +69,7 @@ if $? == 0
     $docker_compose_info = %x(docker-compose version 2>/dev/null)
     $docker_compose_info.each_line do |line|
         if (line[/^docker-compose version/])
-            $docker_compose_version = line[/^docker-compose version\s([0-9]*)/,1].strip
+            $docker_compose_version = line[/^docker-compose version\s*([0-9.]*)/,1].strip
         end
     end
     Facter.add("docker_compose_version") do