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: ''
+
+---
+
+## Describe the bug
+
+_description of what the bug is, and the conditions when it occurs._
+
+## How to reproduce
+Steps to reproduce the behavior:
+
+1.  Go to '...'
+2.  Click on '....'
+3.  Scroll down to '....'
+4.  See error
+
+## Expected behavior
+
+_description of what you expected to happen._
+
+## Official behavior
+
+_description of what happened in the official web ui._
+
+## Versions
+
+- qBittorrent: [e.g. 4.2.5]
+- qb-web: [e.g. 20201023]
+
+## Additional notes
+
+_Add any other notes about the problem here._