remove arm32, travis generates 64 bit which is unexected https://travis-ci.community/t/erlang-otp-21-1-4-is-missing-but-only-for-arm-64/6438/3
remove arm32, travis generates 64 bit which is unexected https://travis-ci.community/t/erlang-otp-21-1-4-is-missing-but-only-for-arm-64/6438/3

AleksandarFilipov/signalbroker-server,AleksandarFilipov/signalbroker-server