use fix base image

Author: hilschernetpi

Dockerfile

@@ -1,5 +1,5 @@
 #use armv7hf compatible base image
-FROM balenalib/armv7hf-debian:stretch
+FROM balenalib/armv7hf-debian:stretch-20191223
 
 #dynamic build arguments coming from the /hooks/build file
 ARG BUILD_DATE

README.md

@@ -2,7 +2,7 @@
 
 [![](https://images.microbadger.com/badges/image/hilschernetpi/netpi-nodered-fieldbus.svg)](https://microbadger.com/images/hilschernetpi/netpi-nodered-fieldbus "Node-RED + fieldbus nodes")
 [![](https://images.microbadger.com/badges/commit/hilschernetpi/netpi-nodered-fieldbus.svg)](https://microbadger.com/images/hilschernetpi//netpi-nodered-fieldbus "Node-RED + fieldbus nodes")
-[![Docker Registry](https://img.shields.io/docker/pulls/hilschernetpi/netpi-nodered-fieldbus.svg)](https://registry.hub.docker.com/u/hilschernetpi/netpi-nodered-fieldbus/) 
+[![Docker Registry](https://img.shields.io/docker/pulls/hilschernetpi/netpi-nodered-fieldbus.svg)](https://registry.hub.docker.com/r/hilschernetpi/netpi-nodered-fieldbus/) 
 [![Image last updated](https://img.shields.io/badge/dynamic/json.svg?url=https://api.microbadger.com/v1/images/hilschernetpi/netpi-nodered-fieldbus&label=Image%20last%20updated&query=$.LastUpdated&colorB=007ec6)](http://microbadger.com/images/hilschernetpi/netpi-nodered-fieldbus "Image last updated") 
 
 Made for [netPI RTE 3](https://www.netiot.com/netpi/), the Raspberry Pi 3B Architecture based industrial suited Open Edge Connectivity Ecosystem *(runs also on Pi + [NHAT 52-RTE](https://www.nethat.net/))*