Erlang/OTP 20 came out June 21[0], so about 5 weeks ago. Makes sense though, Eliir 1.5 was waiting for final release of OTP, and Phoenix was waiting on final release of Elixir, but they'd all had very stable preview releases for a while, so it wasn't a ton of work left on any of them, just finalizing and testing I imagine. I'm super excited to get my side project[1] upgraded to 1.5 and see the new dev conveniences!

[0] https://www.erlang.org/news/114

[1] https://github.com/MasbiaSoupKitchenNetwork/open_pantry