Update base image (#445)

Ale Paredes · web-flow · commit 71490a78917b · 2019-03-26T12:39:59.000-04:00
Because of https://lists.debian.org/debian-devel-announce/2019/03/msg00006.html
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:6.10.0-slim
+FROM node:6.17.0-stretch
 LABEL maintainer "Code Climate <hello@codeclimate.com>"
 
 RUN adduser --uid 9000 --gecos "" --disabled-password app

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-FROM node:6.10.0-slim`
	`1`	`+FROM node:6.17.0-stretch`
`2`	`2`	`LABEL maintainer "Code Climate <hello@codeclimate.com>"`
`3`	`3`
`4`	`4`	`RUN adduser --uid 9000 --gecos "" --disabled-password app`