tokenrenewer: do not buffer signals

Otherwise we lose control on when the signal should be handled.
In particular, buffering disconnect signal causes disconnect
signal for old renewLoop goroutine being handled by the new one.

Author: rjeczalik

tokenrenewer.go

@@ -31,8 +31,8 @@ func NewTokenRenewer(r *Client, k *Kite) (*TokenRenewer, error) {
 	t := &TokenRenewer{
 		client:           r,
 		localKite:        k,
-		signalRenewToken: make(chan struct{}, 1),
-		disconnect:       make(chan struct{}, 1),
+		signalRenewToken: make(chan struct{}),
+		disconnect:       make(chan struct{}),
 	}
 	return t, t.parse(r.Auth.Key)
 }