fix VoiceRegion.ID type (#354)

Author: MCausc78

discord/voice_region.go

@@ -1,10 +1,8 @@
 package discord
 
-import "github.com/disgoorg/snowflake/v2"
-
 // VoiceRegion (https://discord.com/developers/docs/resources/voice#voice-region-object)
 type VoiceRegion struct {
-	ID         snowflake.ID `json:"id"`
+	ID         string       `json:"id"`
 	Name       string       `json:"name"`
 	Vip        bool         `json:"vip"`
 	Optimal    bool         `json:"optimal"`