tests: -y is the default on travis, but not on other ci's

Git-Dch: Ignore

prepare-release

@@ -122,8 +122,8 @@ elif [ "$1" = 'buildlog' ]; then
 		shift
 	done
 elif [ "$1" = 'travis-ci' ]; then
-	apt-get install -q --no-install-recommends $(sed -n -e '/^Build-Depends: /,/^Build-Depends-Indep: / {p}' debian/control | sed -e 's#([^)]*)##g' -e 's#^Build-Depends\(-Indep\)\?: ##' | tr -d ',')
-	apt-get install -q --no-install-recommends $(sed -n 's#^Depends: .*@, \(.*\)$#\1#p' debian/tests/control | tr -d ',')
+	apt-get install -qy --no-install-recommends $(sed -n -e '/^Build-Depends: /,/^Build-Depends-Indep: / {p}' debian/control | sed -e 's#([^)]*)##g' -e 's#^Build-Depends\(-Indep\)\?: ##' | tr -d ',')
+	apt-get install -qy --no-install-recommends $(sed -n 's#^Depends: .*@, \(.*\)$#\1#p' debian/tests/control | tr -d ',')
 elif [ "$1" = 'coverage' ]; then
 	DIR="${2:-./coverage}"
 	git clean -dfX # remove ignored build artefacts for a clean start