Update feature_request.md (#2738)

* Update feature_request.md

About can't be blank

* Update feature_request.md

* Rename feature_request.md to enhancement.md

.github/ISSUE_TEMPLATE/enhancement.md

@@ -0,0 +1,8 @@
+---
+name: Enhancement
+about: 'New feature or request'
+title: ''
+labels: 'enhancement'
+assignees: ''
+
+---

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,8 +0,0 @@
----
-name: Feature request
-about: ''
-title: ''
-labels: ''
-assignees: ''
-
----