Add Qt5 if python 3 specified

- workaround for tests

travis2bash.sh

@@ -85,6 +85,13 @@ function aptinstall() {
     fi
 }
 
+function pyqt5() {
+    # install pyqt5 on python > 3
+    if [[ ! "$TRAVIS_PYTHON" == "2.7" ]]; then
+        sudo apt -y install qtbase5-dev qt5-default
+    fi
+}
+
 function virtualenv_init() {
     # init virtualenv directory
     if [ -n "$3" ]; then
@@ -160,6 +167,7 @@ create_variables "$config_file" travis_
 rundir=$(pwd)
 
 aptinstall
+pyqt5
 
 # shellcheck disable=SC2154
 if [[ "$(declare -p travis_python)" =~ "declare -a" ]]; then