updated travis slack integration to be encrypted
updated travis slack integration to be encrypted

charles-cooper/raiden,tomaaron/raiden,hackaugusto/raiden,hackaugusto/raiden,tomaaron/raiden,tomaaron/raiden,tomashaber/raiden,tomaaron/raiden,tomashaber/raiden,tomashaber/raiden,tomashaber/raiden,tomashaber/raiden,charles-cooper/raiden