update ISSUE_TEMPLATE.md (#3589)

.github/ISSUE_TEMPLATE.md

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+你好，请使用下面的链接创建 issue 以帮助我们更快的排查问题，不规范的 issue 会被关闭，感谢配合。
+
+Please use the link below to create an new issue, the non-standard issue will be closed.
+
+https://youzan.github.io/vant-issue-generater

.github/ISSUE_TEMPLATE/bug-report-----.md

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----
-name: "[Bug Report] 错误报告"
-about: Create a report to help us improve
-
----
-
-IMPORTANT: Please use the following link to create a new issue. If your issue was not created using the app above, it will be closed immediately.
-
-注意：请按照下面的模板来新建 issue，不规范的 issue 会被立即关闭。
-
-**Describe the bug 描述问题**
-
-
-**Screenshots 截图**
-
-
-**Environment 环境**
-
- - Device: 
- - Browser: 
- - Vant Version: 
-
-**Reproduce 复现步骤**
-
-请使用 [codesandbox](https://codesandbox.io/s/m5v3f) 创建一个复现问题的示例，以帮助我们排查问题。

.github/ISSUE_TEMPLATE/feature-request-----.md

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----
-name: "[Feature Request] 功能需求"
-about: Suggest an idea for this project
-
----
-
-IMPORTANT: Please use the following link to create a new issue. If your issue was not created using the app above, it will be closed immediately.
-
-注意：请按照下面的模板来新建 issue，不规范的 issue 会被立即关闭.
-
-**What problem does this feature solve?**
-A clear description of what the problem is.
-
-**Describe the solution you'd like**
-A clear and concise description of what you want to happen.
-
-**What does the proposed API look like?**
-Describe how you propose to solve the problem and provide code samples of how the API would work once implemented.