refactor(MessageMentions): make client, guild, and _content non enumerable
refactor(MessageMentions): make client, guild, and _content non enumerable

Commit: https://github.com/discordjs/discord.js/commit/e8ab049a677335453978afb0261a46da4018dd23
PR: https://github.com/discordjs/discord.js/pull/2542

acdenisSK/discord.js-typings