Jerboa is running ahead and already targeting 0.18 API in their 0.0.35-alpha release.
Unfortunately this was not mentioned very prominently (or at least I did miss it) on github. F-Droid and Playstore still offer previous versions which work with lemmy <0.18.
Since Jerboa itself still needs many updates, I think it would be better to code against the latest stable lemmy release so that many people can use it for testing.
But I'm glad something like Jerboa exists at all, so thanks to the devs for all their work!
So many good recommendations! I'd like to add Ernest Cline's 'Ready Player One' which I thoroughly enjoyed. Look into it if you are looking for a fun quick read and are somewhat interested in computer games and/or role playing.
For all suggested titles I can only recommend to read the books first. The movies are just a pale imitation and are lacking so much! Especially The Expanse but also the above mentioned Ready Player One are to be read IMHO.