Merge branch 'develop' into transformer

.github/ISSUE_TEMPLATE/feature_request.md

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-name: Feature request
-about: Suggest an idea for this project
-title: "[Feature request]"
-labels: feature request
-assignees: ''
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-
-For support and discussions, please use our [Discourse forums](https://github.com/PaddlePaddle/DeepSpeech/discussions).
-
-If you've found a feature request then please create an issue with the following information:
-
-**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 [...]
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-**Describe the solution you'd like**
-A clear and concise description of what you want to happen.
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-**Describe alternatives you've considered**
-A clear and concise description of any alternative solutions or features you've considered.
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-**Additional context**
-Add any other context or screenshots about the feature request here.