issue templates: make use of labels

Author: bilelmoussaoui

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,7 +1,7 @@
 ---
 name: Bug report
 about: Create a report to help us improve
-title: "[BUG]"
+title: ""
 labels: bug
 assignees: ''
 

.github/ISSUE_TEMPLATE/feature-request-or-missing-binding.md

@@ -1,7 +1,7 @@
 ---
 name: Feature request or missing binding
 about: A missing binding or something that could be improved
-title: "[FEATURE REQUEST]"
+title: ""
 labels: enhancement
 assignees: ''