chore(Dockerfile): update go toolchain to 1.7.3

mboersma · mboersma · commit 7e6cb0b71a66 · 2016-10-21T09:44:07.000-06:00
See https://github.com/golang/go/issues?q=milestone%3AGo1.7.3
diff --git a/rootfs/Dockerfile b/rootfs/Dockerfile
@@ -1,6 +1,6 @@
 FROM quay.io/deis/base:v0.3.4
 
-ENV GO_VERSION=1.7.1 \
+ENV GO_VERSION=1.7.3 \
     GLIDE_VERSION=v0.12.3 \
     GLIDE_HOME=/root \
     PATH=$PATH:/usr/local/go/bin:/go/bin \
