Added a release note, plus minor cleanups.

10 jobs for 93-drop-seccomp-support in 60 minutes and 37 seconds (queued for 4 minutes and 33 seconds)
Status Job ID Name Coverage
  Build
passed #1757
docker linux
build:debian:buster:i386

00:09:48

passed #1754
docker linux
build:debian:jessie:amd64

00:08:15

passed #1755
docker linux
build:debian:jessie:i386

00:08:24

passed #1758
docker linux
build:debian:sid:amd64

00:08:57

passed #1759
docker linux
build:debian:sid:i386

00:09:55

passed #1756
docker linux
build:debian:stretch:amd64

00:08:57

passed #1760
docker linux
build:ubuntu:trusty:amd64

00:08:11

passed #1761
docker linux
build:ubuntu:xenial:i386

00:09:16

 
  Test
passed #1762
linux docker
test:debian:sid:amd64

00:40:57

passed #1763
linux docker
test:debian:sid:i386

00:41:23