Update issue templates

.github/ISSUE_TEMPLATE/mu4e-bug-report.md

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+---
+name: Mu4e Bug Report
+about: Create a report to help us improve
+title: "[mu4e bug]"
+labels: bug, mu4e, new
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is, what you excepted to happen and what actually happened.
+
+**To Reproduce**
+Detailed steps to reproduce the behavior. If this is about a specific (kind of) message, **always** attach an (anonymized as need) example message.
+
+**Environment**
+Please describe the versions of OS, Emacs, mu4e etc. you are using.
+
+**Checklist**
+- [ ] you are running vanilla emacs (i.e. without Doom, Evil, Spacemacs etc.) (otherwise, please try to reproduce without those
+- [ ] you are running mu4e with third-party extensions (otherwise, please try to reproduce without those
+- [ ] you are running either the latest 1.4.x release, or a 1.5.11+ development release (otherwise, please upgrade).

.github/ISSUE_TEMPLATE/mu4e-feature-request.md

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+---
+name: Mu4e Feature request
+about: Suggest an idea for this project
+title: "[mu4e rfe]"
+labels: rfe, mu4e, new
+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.