Update and rename feature-request-for-adminlte-v3-x.md to feature-request-for-adminlte-v3.1-x.md

.github/ISSUE_TEMPLATE/feature-request-for-adminlte-v3-x.md

@@ -2,7 +2,7 @@
 name: Feature request for AdminLTE v3.x
 about: Suggest an idea for this project
 title: "[FEATURE]"
-labels: type:enhancement, version:3.x
+labels: type:enhancement, version:3.1.x
 assignees: ''
 
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