[master] Backport 1.30.1 release notes#56163

Merged

bors merged 1 commit intorust-lang:masterfrom

pietroalbini:1.30.1-relnotes-master

Nov 23, 2018

Commits on Nov 22, 2018

Include changes from 1.30.1 in release notes

Mark-Simulacrum
authored and
pietroalbini
committed