Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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-name: Bug report
-about: Create a report to help us improve
-
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-
-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**
-A clear description of what the bug is.
-
-**Screenshots**
-Add screenshots to help explain your problem.
-
-**Environment**
- - Device: 
- - Browser: 
- - Vant Version: 
-
-**Reproduce**
-Provide the steps to reproduce and if possible a minimal demo of the problem via jsfiddle.
-https://jsfiddle.net/dfarLdko/1/