Delete feature_request.md

.github/ISSUE_TEMPLATE/feature_request.md

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----
-name: Feature request
-about: Suggest a new feature
-title: ''
-labels: feature
-assignees: ''
-
----
-
-**Describe the feature you'd like**
-<!-- A clear and concise description of what you want to happen. -->
-
-**Additional context**
-<!-- Add any other context or screenshots about the feature request here. -->