Update bug_report.md

Author: hathach

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,8 +1,8 @@
 ---
 name: Bug report
 about: Create a report to help us improve
-title: "[Bug]"
-labels: ''
+title: ""
+labels: 'Bug'
 assignees: ''
 
 ---