Remove Ubuntu 19.04 "Disco Dingo" (EOL: 2020-01-23)

Ubuntu 19.04 "Disco Dingo" reached EOL on 2020-01-23: https://fridge.ubuntu.com/2020/01/23/ubuntu-19-04-disco-dingo-end-of-life-reached-on-january-23-2020/

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
(cherry picked from commit 38aadec)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: e1a64b584b0599ba596e6b7ff7a5567c94e10a82
Component: packaging

Author: AkihiroSuda

components/packaging/README.md

@@ -9,7 +9,6 @@ The scripts will build for this list of packages types:
 
 * DEB packages for Ubuntu 20.04 Focal
 * DEB packages for Ubuntu 19.10 Eoan
-* DEB packages for Ubuntu 19.04 Disco
 * DEB packages for Ubuntu 18.04 Bionic
 * DEB packages for Ubuntu 16.04 Xenial
 * DEB packages for Debian 10 Buster

components/packaging/deb/Makefile

@@ -36,7 +36,7 @@ RUN=docker run --rm -i \
 	debbuild-$@/$(ARCH)
 
 DEBIAN_VERSIONS := debian-stretch debian-buster
-UBUNTU_VERSIONS := ubuntu-xenial ubuntu-bionic ubuntu-disco ubuntu-eoan ubuntu-focal
+UBUNTU_VERSIONS := ubuntu-xenial ubuntu-bionic ubuntu-eoan ubuntu-focal
 RASPBIAN_VERSIONS := raspbian-stretch raspbian-buster
 DISTROS := $(DEBIAN_VERSIONS) $(UBUNTU_VERSIONS) $(RASPBIAN_VERSIONS)