Fix spelling mistake

client.go

@@ -438,7 +438,7 @@ func (c *Client) Reset() error {
 }
 
 // Noop sends the NOOP command to the server. It does nothing but check
-// that the connaction to the server is okay.
+// that the connection to the server is okay.
 func (c *Client) Noop() error {
 	if err := c.hello(); err != nil {
 		return err