Release v0.5.3

This is a bugfix release.

I found a nasty bug that prevented the use of sound cards with sampling rates other than 48kHz on input devices (e.g. microphones). On Soundcards with arbitrary sampling rates are supported - for example, the very common 44100Hz. remoteAudio will transparently up- or downsample the audio stream(s) to 48kHz which is required by the opus codec.