Update issue templates

.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**
+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/

.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.