discord/composer.json: drop PHP 5 support
discord/composer.json: drop PHP 5 support

The most recent version of the illuminate/support package requires
PHP 7+. Since we are only using the discord service from within
a Docker container, we can drop the PHP 5 support to avoid using
an outdated dependency.

hemberger/smr,smrealms/smr,smrealms/smr,hemberger/smr,smrealms/smr,hemberger/smr,hemberger/smr