Update readme-vars.yml

Adding :Z to the -v parameter will cause docker to automaticly relabel the specified files to the proper permissions eliminating permission denied errors https://stackoverflow.com/questions/35218194/what-is-z-flag-in-docker-containers-volumes-from-option

readme-vars.yml

@@ -22,7 +22,7 @@ param_env_vars:
   - {env_var: "TZ", env_value: "Europe/London", desc: "Specify a timezone to use EG Europe/London."}
 param_usage_include_vols: true
 param_volumes:
-  - { vol_path: "/config", vol_host_path: "/path/to/{{ project_name }}/config", desc: "Persistent config files" }
+  - { vol_path: "/config", vol_host_path: "/path/to/{{ project_name }}/config:Z", desc: "Persistent config files" }
 param_usage_include_ports: false
 param_device_map: false
 cap_add_param: false