Fix #177: Misleading exception type in DiscordEmbedBuilder.AddField (#178)
Fix #177: Misleading exception type in DiscordEmbedBuilder.AddField (#178)

Misleading exception type in DiscordEmbedBuilder.AddField. Fixes #177.
uwx/DSharpPlus,uwx/DSharpPlus,Emzi0767/DSharpPlus