yaml.load(config_file) error

got this error on startup with yaml file
```
    config = yaml.load(config_file)
  File "/usr/lib64/python3.5/site-packages/yaml/__init__.py", line 109, in load
    raise RuntimeError("Unsafe load() call disabled by Gentoo. See bug #659348")
RuntimeError: Unsafe load() call disabled by Gentoo. See bug #659348
```
this fix works for me:
   config = yaml.safe_load(config_file)
