Merge pull request #14 from fnaoto/2022-06-09

Fix response body.

client.go

@@ -1,6 +1,7 @@
 package deploygate
 
 import (
+	"bytes"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -107,7 +108,9 @@ func (c *Client) NewRequest(httpRequest *HttpRequest) (*http.Response, error) {
 func (c *Client) Decode(resp *http.Response, out interface{}) error {
 	defer resp.Body.Close()
 	if resp.StatusCode >= 300 {
-		return fmt.Errorf("status code is %v, body is %v", resp.StatusCode, resp.Body)
+		buf := new(bytes.Buffer)
+		buf.ReadFrom(resp.Body)
+		return fmt.Errorf("status code is %v, body is %v", resp.StatusCode, buf.String())
 	}
 	if resp.ContentLength == 0 {
 		return nil