.travis.yml: add armhf:bionic arm64:melodic

[k-okada]

http://build.ros.org/job/Mbin_ubhf_uBhf__jskeus__ubuntu_bionic_armhf__binary/100/console

09:35:21 gcc -g -c -o /tmp/binarydeb/ros-melodic-jskeus-1.2.1/debian/ros-melodic-jskeus/opt/ros/melodic/share/euslisp/jskeus/eus/LinuxARM/obj/pgsql.o -DARM -DLinux -Wimplicit -falign-functions=4 -DGCC3  -DGCC  -DTHREADED -DPTHREAD -fpic  -I/opt/ros/melodic/share/euslisp/jskeus/eus/include -O2 /tmp/1434/pgsql.c; ld -shared -build-id -o /tmp/binarydeb/ros-melodic-jskeus-1.2.1/debian/ros-melodic-jskeus/opt/ros/melodic/share/euslisp/jskeus/eus/LinuxARM/obj/pgsql.so /tmp/binarydeb/ros-melodic-jskeus-1.2.1/debian/ros-melodic-jskeus/opt/ros/melodic/share/euslisp/jskeus/eus/LinuxARM/obj/pgsql.o
09:35:31 Segmentation fault (core dumped)