👷 Update issue templates

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug report
+about: Create a bug report to help us improve
+title: 'Bug: Something went wrong'
+labels: bug
+assignees: ''
+
+---
+
+**描述问题：**
+
+A clear and concise description of what the bug is.
+
+**如何复现？**
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**期望的结果**
+
+A clear and concise description of what you expected to happen.
+
+**环境信息：**
+
+ - OS: [e.g. Linux]
+ - Python Version: [e.g. 3.8]
+ - Nonebot Version [e.g. 2.0.0]
+
+**截图**
+
+If applicable, add screenshots to help explain your problem.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: 'Feature: Something you want'
+labels: enhancement
+assignees: ''
+
+---
+
+**是否在使用中遇到某些问题而需要新的特性？请描述：**
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**描述你所需要的特性：**
+
+A clear and concise description of what you want to happen.