Fix test

Author: lunny

tests/integration/issue_test.go

@@ -187,7 +187,7 @@ func testIssueAddComment(t *testing.T, session *TestSession, issueURL, content,
 func testIssueChangeMilestone(t *testing.T, session *TestSession, repoLink string, issueID, milestoneID int64) {
 	req := NewRequestWithValues(t, "POST", fmt.Sprintf(repoLink+"/issues/milestone?issue_ids=%d", issueID), map[string]string{
 		"_csrf": GetUserCSRFToken(t, session),
-		"id":    strconv.FormatInt(milestoneID, 64),
+		"id":    strconv.FormatInt(milestoneID, 10),
 	})
 	resp := session.MakeRequest(t, req, http.StatusOK)
 	assert.Equal(t, `{"ok":true}`, strings.TrimSpace(resp.Body.String()))