Disable streak counter for us site (#382)

Author: j178

cmd/submit.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 
@@ -153,6 +154,9 @@ func appendToTestCases(q *leetcode.QuestionData, result *leetcode.SubmitCheckRes
 
 func showTodayStreak(c leetcode.Client, cmd *cobra.Command) error {
 	streak, err := c.GetStreakCounter()
+	if errors.Is(err, errors.ErrUnsupported) {
+		return nil
+	}
 	if err != nil {
 		return err
 	}

leetcode/client_us.go

@@ -361,3 +361,7 @@ func (c *usClient) GetQuestionTags() ([]QuestionTag, error) {
 	}
 	return tags, nil
 }
+
+func (c *usClient) GetStreakCounter() (StreakCounter, error) {
+	return StreakCounter{}, errors.ErrUnsupported
+}