doc：modify ISSUE_TEMPLATE

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,8 +1,8 @@
 ---
 name: 'Bug Report'
 about: '创建错误报告以帮助我们改进。'
-title: ''
-labels: ''
+title: '[bug]'
+labels: 'bug'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/question.md

@@ -1,8 +1,8 @@
 ---
 name: Question
 about: 问我们一个关于这个项目的问题
-title: ''
-labels: ''
+title: '[question]'
+labels: 'question'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/suggestion.md

@@ -1,8 +1,8 @@
 ---
 name: Suggestion
 about: 为这个项目提出一个建议
-title: ''
-labels: ''
+title: '[suggest]'
+labels: 'help wanted'
 assignees: ''
 
 ---