add "check Validate" support

cmd/luncher/luncher.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"github.com/Tnze/go-mc/yggdrasil"
+	"os"
+)
+
+var user = flag.String("user", "", "Can be an email address or player name for unmigrated accounts")
+var pswd = flag.String("password", "", "Your password")
+
+func main() {
+	flag.Parse()
+
+	resp, err := yggdrasil.Authenticate(*user, *pswd)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	id, name := resp.SelectedProfile()
+	fmt.Println("user:", name)
+	fmt.Println("uuid:", id)
+	fmt.Println("astk:", resp.AccessToken())
+}

cmd/substitute_server/substitute.go

@@ -374,7 +374,7 @@ func (c *Client) encryptionResponse() ([]byte, []byte, error) {
 		return nil, nil, err
 	}
 	if p.ID != 0x01 {
-		return nil, nil, fmt.Errorf("0x%02X is not Encryption AuthResp", p.ID)
+		return nil, nil, fmt.Errorf("0x%02X is not Encryption authResp", p.ID)
 	}
 
 	var (