Fix latency of pulseaudio

[rerrahkr]

Close #363
Does it works well on PulseAudio and ALSA?

[freq-mod]

can confirm it works well for me

[nyanpasu64]

I didn't get notified of this branch. But it works for me as well.

EDIT: Setting numberOfBuffers=2 should be a reasonable default, but I don't know whether it changes the behavior of Bamboo on APIs other than Pulse. It shouldn't be a problem on any OS, but I don't know if it will change the latency in ways that users don't expect. It's probably worth noting on the changelog that latency may be different.

[rerrahkr]

Thanks for your advice. I'll add it to IMPORTANT.md, where other important changes are listed.