Bump to Go-1.5.3

Security update: https://groups.google.com/forum/#!topic/golang-announce/MEATuOi_ei4

Signed-off-by: Ivan Mikushin <i.mikushin@gmail.com>

Author: imikushin

Dockerfile

@@ -1,5 +1,5 @@
 # This file describes the standard way to build libcompose, using docker
-FROM golang:1.5.2
+FROM golang:1.5.3
 
 RUN apt-get update && apt-get install -y \
     iptables \