Update golang to 1.9

Lorac · web-flow · commit 97e5f9e4f638 · 2017-08-29T00:49:58.000-04:00
diff --git a/Dockerfile b/Dockerfile
@@ -1,3 +1,3 @@
-FROM golang:alpine
+FROM golang:1.9-alpine3.6
 
 RUN apk add --no-cache git
