Version 5.1 is now out with a couple of nice improvements. One of them is that the Cocoapods are now up-to-date!
One rendering improvement is the look of black mensural notation oblique ligatures with curved shape instead of straight polygons.
This release also improved the time map output of Verovio for grace notes are arpeggios, allowing for better synchronisation of the MIDI output (and potentially audio) and the scores rendered by Verovio.