Update issue templates

.github/ISSUE_TEMPLATE/feature_request.md

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