support docker 1.17.x (#15)

1.17.x doesn't like labels/environment specified as a list, converted to
maps

docker-compose.yml

@@ -7,10 +7,10 @@ services:
     command: "-bootstrap -bind 0.0.0.0 -client 0.0.0.0 -ui"
     dns_search: ""
     labels:
-      - "SERVICE_8500_CHECK_TCP=true"
-      - "SERVICE_8500_CHECK_INTERVAL=15s"
-      - "SERVICE_8500_NAME=consul"
-      - "SERVICE_8500_TAGS=urlprefix-consul.*/"
+      SERVICE_8500_CHECK_TCP: "true"
+      SERVICE_8500_CHECK_INTERVAL: "15s"
+      SERVICE_8500_NAME: "consul"
+      SERVICE_8500_TAGS: "urlprefix-consul.*/"
     restart: always
 
   registrator:
@@ -29,12 +29,12 @@ services:
     volumes:
       - "./ssl:/ssl"
     environment:
-      - "FABIO_PROXY_CS=cs=ssl;type=path;cert=/ssl"
-      - "FABIO_PROXY_ADDR=:80,:443;cs=ssl"
-      - "FABIO_UI_TITLE=Tugboat Services"
-      - "FABIO_UI_COLOR=blue"
-      - "REGISTRY_CONSUL_ADDR=consul:8500"
-      - "REGISTRY_CONSUL_REGISTER_TAGS=urlprefix-fabio.*/,urlprefix-dev.*/"
+      FABIO_PROXY_CS: "cs=ssl;type=path;cert=/ssl"
+      FABIO_PROXY_ADDR: ":80,:443;cs=ssl"
+      FABIO_UI_TITLE: "Tugboat Services"
+      FABIO_UI_COLOR: "blue"
+      REGISTRY_CONSUL_ADDR: "consul:8500"
+      REGISTRY_CONSUL_REGISTER_TAGS: "urlprefix-fabio.*/,urlprefix-dev.*/"
     ports:
       - "80:80"
       - "443:443"