DiscordKit: can receive and decode hello event

Sources/DiscordKit/ApiClient.swift

@@ -26,11 +26,10 @@ struct ApiClient {
         let json = JSONDecoder()
         let decoded = try json.decode(GetGatewayResponse.self, from: data)
         return decoded.url
-
     }
 }
 
-enum ApiError: Error {
+public enum ApiError: Error {
     case invalidResponse
     case badStatus(_ message: String)
 }