message: Add stack exchange to build script
  Added the eosio stack exchange to the end of the build script.
diff: printf "\\tEOSIO website: https://eos.io\\n"
  printf "\\tEOSIO Telegram channel @ https://t.me/EOSProject\\n"
  printf "\\tEOSIO resources: https://eos.io/resources/\\n"
  + printf "\\tEOSIO Stack Exchange: https://eosio.stackexchange.com\\n"
  printf "\\tEOSIO wiki: https://github.com/EOSIO/eos/wiki\\n\\n\\n"
  if [ "x${EOSIO_BUILD_PACKAGE}" != "x" ]; then
  