:octocat: 更新 GitHub issue 模板

.github/ISSUE_TEMPLATE/bug_report.md

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 name: Bug report 报告缺陷
 about: Create a report to help us improve 报告缺陷以帮助我们改进
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 **Describe the bug 描述问题**

.github/ISSUE_TEMPLATE/feature_request.md

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 name: Feature request 请求新功能
 about: Suggest an idea for this project 请提出你的建议或意见
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 **Is your feature request related to a problem? Please describe. 你在什么场景下需要该功能？**