chore(Dockerfile): update distribution to 2.2.1

mboersma · mboersma · commit ee9e3e7f62a2 · 2016-01-11T19:48:33.000-07:00
diff --git a/Dockerfile b/Dockerfile
@@ -1,6 +1,6 @@
 FROM alpine:3.2
 
-ENV DOCKER_REGISTRY_TAG=v2.2.0 \
+ENV DOCKER_REGISTRY_TAG=v2.2.1 \
     DOCKER_REGISTRY_REPO=https://github.com/docker/distribution.git
 
 # install registry binaries
