Keep progress of every book's chapter

[marlomjobsom]

@PaulWoitaschek , first of all thank you for your time developing this application for the community. It is well design, simple and delivers a great solution for a problem that other apps adds too much features that makes confusing the application.

By using Voice app, I noticed it does keep track of the book progress, but not of its chapters.
I listen some minutes of a chapter, then I go to the next one of the same book, then, going back to the previous one and it started playing from the very beggining.

That would be amazing if Voice app could keep track of the progress of every book's chapter, regardless if it the current one being played.