example/index.js: Segmentation fault

Reproduced on node-blueooth v1.2.6 running in a container

* Official Docker image `node:10.17`
* node v10.17.0
* Debian GNU/Linux 9 (stretch)

```
root@1fe89f7b3fe0:/app/node_modules/node-bluetooth# node --version
v10.17.0
root@1fe89f7b3fe0:/app/node_modules/node-bluetooth# node example/index.js
Segmentation fault
root@1fe89f7b3fe0:/app/node_modules/node-bluetooth#
```

Start with example/index.js and reproduce the failure in the documented node:10.17 container using Node v10.17.0 on Debian 9. Investigate why running the example ends with a segmentation fault; done means the example runs without crashing under the reported environment.

Written by the indexing model from the issue text.