Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: bug
+assignees: blueloveTH
+
+---
+
+Thanks for taking the time to fill out a bug report!
+Please provide a descriptive title above and fill in the following fields.
+
+### Bug description
+A clear and concise description of what the bug is.
+You can paste sources here that may cause the error.
+
+### Steps to reproduce
+- upload the full stacktrace from your own code line to the error line
+- upload a minimum reproducible example
+- additional information to help us reproduce the error
+
+### Environment information
+You need to provide these strings:
+- pocketpy's version
+- platform string (win32/linux/darwin/emscripten/android/ios)
+- 32-bit or 64-bit
+
+### Additional context
+Add any other context about the error.