Influxdb:latest > 1.8 breaks the framework sample

Docker-compose file uses influxdb:latest which has caused to break with the latest release of influx.

By pinning influxdb to 1.8 the framework remains operational for people to give it a try.

services:
  influxdb:
    image: influxdb:1.8

Expected behavior

Follow instructions and have a working instance of grafana & influxdb

Actual Behavior

Grafana fails to establish connection with influx after update to 2.X

Workaround

Apply change locally described above