Dockerfile: Update to alpine:3.11 (#918)

sootysec · web-flow · commit 4a08e118f19c · 2020-06-01T19:31:16.000+05:30
Signed-off-by: Daniel Sutton &lt;daniel@ducksecops.uk&gt;
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.9
+FROM alpine:3.11
 
 RUN apk add --no-cache \
       iptables \
