added useragent (bwmarrin#653)

discord.go

@@ -58,6 +58,7 @@ func New(args ...interface{}) (s *Session, err error) {
 		ShardCount:             1,
 		MaxRestRetries:         3,
 		Client:                 &http.Client{Timeout: (20 * time.Second)},
+		UserAgent:              "DiscordBot (https://github.com/bwmarrin/discordgo, v" + VERSION + ")",
 		sequence:               new(int64),
 		LastHeartbeatAck:       time.Now().UTC(),
 	}

restapi.go

@@ -90,7 +90,7 @@ func (s *Session) RequestWithLockedBucket(method, urlStr, contentType string, b
 
 	req.Header.Set("Content-Type", contentType)
 	// TODO: Make a configurable static variable.
-	req.Header.Set("User-Agent", "DiscordBot (https://github.com/bwmarrin/discordgo, v"+VERSION+")")
+	req.Header.Set("User-Agent", s.UserAgent)
 
 	if s.Debug {
 		for k, v := range req.Header {

structs.go

@@ -82,6 +82,9 @@ type Session struct {
 	// The http client used for REST requests
 	Client *http.Client
 
+	// The user agent used for REST APIs
+	UserAgent string
+
 	// Stores the last HeartbeatAck that was recieved (in UTC)
 	LastHeartbeatAck time.Time