Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,7 +1,7 @@
 ---
 name: "\U0001F41E  Bug report"
 about: Create a bug report
-title: "[Bug]"
+title: ''
 labels: status/triage, type/bug
 assignees: ''
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,7 +1,7 @@
 ---
 name: "\U0001F680 Feature request"
 about: Propose a new feature
-title: "[Feature]"
+title: ''
 labels: status/triage, type/feature
 assignees: ''