Error: EACCES: permission denied, mkdir '/root/.homebridge/plugin-persist/homebridge-broadlink-rm'
hi,

I installed your docker-homebridge in synology docker, and when I add the platform "homebridge-broadlink-rm", this err was append: 

Error: EACCES: permission denied, mkdir '/root/.homebridge/plugin-persist/homebridge-broadlink-rm'

can you tell me how to fix this bug?
thanks  a lot.


```
date | stream | content
-- | -- | --
2018-03-22 16:53:07 | stdout | *** WARNING *** For more information see <http://0pointer.de/avahi-compat?s=libdns_sd&e=node&f=DNSServiceRegister>
2018-03-22 16:53:07 | stdout | *** WARNING *** Please fix your application to use the native API of Avahi!
2018-03-22 16:53:07 | stdout | *** WARNING *** The program 'node' called 'DNSServiceRegister()' which is not supported (or only supported partially) in the Apple Bonjour compatibility layer of Avahi.
2018-03-22 16:53:07 | stdout | *** WARNING *** For more information see <http://0pointer.de/avahi-compat?s=libdns_sd&e=node>
2018-03-22 16:53:07 | stdout | *** WARNING *** Please fix your application to use the native API of Avahi!
2018-03-22 16:53:07 | stdout | *** WARNING *** The program 'node' uses the Apple Bonjour compatibility layer of Avahi.
2018-03-22 16:53:06 | stdout | -U /homebridge -P /homebridge/node_modules
2018-03-22 16:53:00 | stdout |  
2018-03-22 16:53:00 | stdout | at bootstrap_node.js:609:3
2018-03-22 16:53:00 | stdout | at startup (bootstrap_node.js:188:16)
2018-03-22 16:53:00 | stdout | at Function.Module.runMain (module.js:693:10)
2018-03-22 16:53:00 | stdout | at Function.Module._load (module.js:497:3)
2018-03-22 16:53:00 | stdout | at tryModuleLoad (module.js:505:12)
2018-03-22 16:53:00 | stdout | at Module.load (module.js:565:32)
2018-03-22 16:53:00 | stdout | at Object.Module._extensions..js (module.js:663:10)
2018-03-22 16:53:00 | stdout | at Module._compile (module.js:652:30)
2018-03-22 16:53:00 | stdout | at Object.<anonymous> (/usr/local/lib/node_modules/homebridge/bin/homebridge:17:22)
2018-03-22 16:53:00 | stdout | at module.exports (/usr/local/lib/node_modules/homebridge/lib/cli.js:40:10)
2018-03-22 16:53:00 | stdout | at Server.run (/usr/local/lib/node_modules/homebridge/lib/server.js:85:36)
2018-03-22 16:53:00 | stdout | at Server._loadPlatforms (/usr/local/lib/node_modules/homebridge/lib/server.js:304:32)
2018-03-22 16:53:00 | stdout | at new BroadlinkRMPlatform (/homebridge/node_modules/homebridge-broadlink-rm/platform.js:23:29)
2018-03-22 16:53:00 | stdout | at new HomebridgePlatform (/homebridge/node_modules/homebridge-platform-helper/platform.js:14:21)
2018-03-22 16:53:00 | stdout | at Object.init (/homebridge/node_modules/homebridge-platform-helper/helpers/persistentState.js:10:15)
2018-03-22 16:53:00 | stdout | at Object.nodePersist.initSync (/homebridge/node_modules/node-persist/src/node-persist.js:37:32)
2018-03-22 16:53:00 | stdout | at LocalStorage.initSync (/homebridge/node_modules/node-persist/src/local-storage.js:142:14)
2018-03-22 16:53:00 | stdout | at LocalStorage.parseStorageDirSync (/homebridge/node_modules/node-persist/src/local-storage.js:619:20)
2018-03-22 16:53:00 | stdout | at Function.sync (/homebridge/node_modules/mkdirp/index.js:71:13)
2018-03-22 16:53:00 | stdout | at Object.fs.mkdirSync (fs.js:885:18)
2018-03-22 16:53:00 | stdout | Error: EACCES: permission denied, mkdir '/root/.homebridge/plugin-persist/homebridge-broadlink-rm'
2018-03-22 16:53:00 | stdout |  
2018-03-22 16:53:00 | stdout | ^
2018-03-22 16:53:00 | stdout | throw err0;
2018-03-22 16:53:00 | stdout | /homebridge/node_modules/mkdirp/index.js:90
2018-03-22 16:53:00 | stdout | [2018-3-22 16:53:00] [Broadlink RM] Initializing BroadlinkRM platform...

```