Delete feature_request.md

.github/ISSUE_TEMPLATE/feature_request.md

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----
-name: Feature Request
-about: If you have any interesting advice, you can tell us.
----
-
-## Specific Demand
-
-<!--
-What feature do you need, please describe it in detail.
--->
-
-## Implement Suggestion
-
-<!--
-If you have any suggestion for complete this feature, you can tell us.
--->