Add CI checks

.travis.yml

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+language: cpp
+os: linux
+
+jobs:
+  include:
+    # 18.04/bionic
+    - os: linux
+      compiler: gcc
+      dist: bionic
+
+    # 20.04/focal
+    - os: linux
+      compiler: gcc
+      dist: focal
+
+before_install:
+  - bash ${TRAVIS_BUILD_DIR}/.travis/before_install.sh
+
+install:
+  - bash ${TRAVIS_BUILD_DIR}/.travis/install.sh
+
+script:
+  - make
+  - bash ${TRAVIS_BUILD_DIR}/.travis/script.sh
+
+#notifications:
+  #email: true
+  #irc: "ircs://chat.freenode.net:7070/#kxstudio"

.travis/before_install.sh

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+#!/bin/bash
+
+set -e
+
+# sudo add-apt-repository -y ppa:kxstudio-debian/kxstudio
+# sudo add-apt-repository -y ppa:kxstudio-debian/toolchain
+
+sudo apt-get update -qq
+# sudo apt-get install kxstudio-repos
+# sudo apt-get update -qq

.travis/install.sh

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+#!/bin/bash
+
+set -e
+
+sudo apt-get install -y \
+    pylint3 \
+    python3-pyqt5 python3-pyqt5.qtsvg python3-pyqt5.qtopengl \
+    pyqt5-dev-tools \
+    qtbase5-dev

.travis/script.sh

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+#!/bin/bash
+
+set -e
+
+if which pylint3 >/dev/null; then
+  pylint='pylint3'
+else
+  pylint='pylint'
+fi
+
+${pylint} \
+    --extension-pkg-whitelist=dbus.mainloop.pyqt5,PyQt5 \
+    -E \
+    --disable=unsubscriptable-object \
+    src/*.py