RichEmbed Tweaks/Improvements (#964)
RichEmbed Tweaks/Improvements (#964)

* RichEmbed Tweaks/Improvements

Changed .addTimestamp() to .setTimestamp() to bring it inline with all other single value settings.
Changed Field value to StringResolveable from String to bring it inline with typical sendMessage functionality.

* Lint Fix

* Remove Default, Add check for undefined

appellation/discord.js,robflop/discord.js,robflop/discord.js,aemino/discord.js,appellation/discord.js,Lewdcario/discord.js,aemino/discord.js,Drahcirius/discord.js,robflop/discord.js,aemino/discord.js,SpaceEEC/discord.js,devsnek/discord.js,devsnek/discord.js,zajrik/discord.js,hydrabolt/discord.js,Lewdcario/discord.js,Drahcirius/discord.js,Lewdcario/discord.js,zajrik/discord.js,CodeMan99/discord.js,devsnek/discord.js,hydrabolt/discord.js,CodeMan99/discord.js,SpaceEEC/discord.js,appellation/discord.js,zajrik/discord.js,SpaceEEC/discord.js,CodeMan99/discord.js,hydrabolt/discord.js,Drahcirius/discord.js