Travis test fail becaise of missing bluetooth.h

I get `

node-bluetooth@1.2.5 install /home/travis/build/frankjoke/ioBroker.radar2/node_modules/node-bluetooth
node-gyp configure build
make: Entering directory /home/travis/build/frankjoke/ioBroker.radar2/node_modules/node-bluetooth/build' CXX(target) Release/obj.target/BluetoothSerialPort/src/linux/BluetoothSerialPort.o CXX(target) Release/obj.target/BluetoothSerialPort/src/linux/DeviceINQ.o ../src/linux/DeviceINQ.cc:35:37: fatal error: bluetooth/bluetooth.h: No such file or directory #include <bluetooth/bluetooth.h> ^ compilation terminated. make: *** [Release/obj.target/BluetoothSerialPort/src/linux/DeviceINQ.o] Error 1 make: Leaving directory /home/travis/build/frankjoke/ioBroker.radar2/node_modules/node-bluetooth/build'
gyp ERR! build error
gyp ERR! stack Error: make failed with exit code: 2`

errors and cannot test my package on Travis (for linuix) but on Raspian and Ubuntu install works.

The error is: /src/linux/DeviceINQ.cc:35:37: fatal error: bluetooth/bluetooth.h
and I could not find it as well.

On windows tester AppVeyor the installation works and all tests passes.

The effect started when I added your package to mine. If I remove the dependency it's installing fine.

Start with the Linux build failure in src/linux/DeviceINQ.cc and inspect the Travis configuration and dependency setup around node-bluetooth. Reproduce the missing bluetooth/bluetooth.h error on Travis or an equivalent Linux environment, then verify that installation and the existing tests pass as they do on Ubuntu, Raspbian, and AppVeyor.