chore(Makefile): update go-dev to 0.11.1

See https://github.com/deis/docker-go-dev/releases/tag/0.11.1

Author: mboersma

Makefile

@@ -11,7 +11,7 @@ REPO_PATH = github.com/deis/registry
 
 # The following variables describe the containerized development environment
 # and other build options
-DEV_ENV_IMAGE := quay.io/deis/go-dev:0.10.0
+DEV_ENV_IMAGE := quay.io/deis/go-dev:0.11.1
 DEV_ENV_WORK_DIR := /go/src/${REPO_PATH}
 DEV_ENV_PREFIX := docker run --rm -e GO15VENDOREXPERIMENT=1 -v ${CURDIR}:${DEV_ENV_WORK_DIR} -w ${DEV_ENV_WORK_DIR}
 DEV_ENV_CMD := ${DEV_ENV_PREFIX} ${DEV_ENV_IMAGE}