https://www.theregister.co.uk/2018/11/06/linus_420_linux/

The new, improved, and chilled-out Linus Torvalds emitted the first release candidate for Linux kernel 4.20 over the weekend.

He decided not to repeat the jump from 3.19 to 4.0 that happened last year, thus avoiding leaping from 4.19 to 5.0, because “I didn't want to make a pattern of it,” he told the kernel's official development mailing list.