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: ''
+labels: ''
+assignees: ''
+
+---
+
+* hardcoverapp.koplugin version:
+* KOReader version:
+* Device:
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+** `crash.log` (if applicable)**
+`crash.log` is a file that is automatically created when KOReader crashes. It can normally be found in the KOReader directory:
+
+* `/mnt/private/koreader` for Cervantes
+* `koreader/` directory for Kindle
+* `.adds/koreader/` directory for Kobo
+* `applications/koreader/` directory for Pocketbook
+
+Android logs are kept in memory. Please go to [Menu] → Help → Bug Report to save these logs to a file.
+
+Please try to include the relevant sections in your issue description.
+You can upload the whole `crash.log` file (zipped if necessary) on GitHub by dragging and dropping it onto this textbox.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.