Update to master fails
Ich versuche gerade auf die Master zu updaten dies schlägt aber wenn ich es wie hier beschrieben https://github.com/thkl/homebridge-homematic/wiki/Update auf meinem Rasp3 ausführe wie folgt fehl. Was mach ich falsch ?

(a) `npm install thkl/homebridge-homematic#master -g --unsafe-perm`
(b) `sudo npm install thkl/homebridge-homematic#master -g --unsafe-perm`

(a)
```
pi@raspberrypi:~ $ npm install thkl/homebridge-homematic#master -g --unsafe-perm
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/homebridge-homematic
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/homebridge-homematic/node_modules
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules
npm ERR! path /usr/local/lib/node_modules/homebridge-homematic
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall access
npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules/homebridge-homematic'
npm ERR!  { Error: EACCES: permission denied, access '/usr/local/lib/node_modules/homebridge-homematic'
npm ERR!   stack: 'Error: EACCES: permission denied, access \'/usr/local/lib/node_modules/homebridge-homematic\'',
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'access',
npm ERR!   path: '/usr/local/lib/node_modules/homebridge-homematic' }
npm ERR! 
npm ERR! The operation was rejected by your operating system.
npm ERR! It is likely you do not have the permissions to access this file as the current user
npm ERR! 
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator (though this is not recommended).

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/pi/.npm/_logs/2018-04-09T18_22_16_026Z-debug.log
```

(b)
```
pi@raspberrypi:~ $ sudo npm install thkl/homebridge-homematic#master -g --unsafe-perm
npm ERR! code 128
npm ERR! Command failed: /usr/bin/git clone --depth=1 -q -b master git://github.com/thkl/homebridge-homematic.git /root/.npm/_cacache/tmp/git-clone-299a0692
npm ERR! fatal: could not create leading directories of '/root/.npm/_cacache/tmp/git-clone-299a0692': Permission denied
npm ERR! 

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2018-04-09T18_24_20_751Z-debug.log
```