Add MaxIdemponentCallAttempts to fasthttp.Client (#484)

* Add MaxIdemponentCallAttempts to fasthttp.Client

client.go

@@ -188,6 +188,11 @@ type Client struct {
 	// after DefaultMaxIdleConnDuration.
 	MaxIdleConnDuration time.Duration
 
+	// Maximum number of attempts for idempotent calls
+	//
+	// DefaultMaxIdemponentCallAttempts is used if not set.
+	MaxIdemponentCallAttempts int
+
 	// Per-connection buffer size for responses' reading.
 	// This also limits the maximum header size.
 	//
@@ -400,6 +405,7 @@ func (c *Client) Do(req *Request, resp *Response) error {
 			TLSConfig:                     c.TLSConfig,
 			MaxConns:                      c.MaxConnsPerHost,
 			MaxIdleConnDuration:           c.MaxIdleConnDuration,
+			MaxIdemponentCallAttempts:     c.MaxIdemponentCallAttempts,
 			ReadBufferSize:                c.ReadBufferSize,
 			WriteBufferSize:               c.WriteBufferSize,
 			ReadTimeout:                   c.ReadTimeout,