Use alpine:3.5 as base (#24)

blueyed · web-flow · commit bd22b388d6b4 · 2017-03-25T00:46:45.000+01:00
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.4
+FROM alpine:3.5
 
 RUN apk --update add bash \
   && rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
