8k sample rate

[mpeguerus]

The doc says that 8k is supported, but in reality only 16k and any valid number (N%8000==0) can be passed.

https://github.com/davehorton/drachtio-freeswitch-modules/blob/21e543ddde7c6f69712a4e278a57cea7812fd3ec/modules/mod_audio_fork/mod_audio_fork.c#L187

another else if there will make 8k supported:

if (0 == strcmp(argv[4], "16k")) {
        sampling = 16000;
 } else if (0 == strcmp(argv[4], "8k")) {
        sampling = 8000;
 } else {
	sampling = atoi(argv[4]);
}

[davehorton]

Thanks, could you give me a PR for that change?

[davehorton]

I fixed this