fix GitHub issue template

related to #1

PiperOrigin-RevId: 715773692
Change-Id: If41776902ec7d19f4799d0d6d3d4e2eaee4353b4

Author: stapelberg

.github/ISSUE_TEMPLATE.md .github/ISSUE_TEMPLATE/bug_report.md

@@ -1,3 +1,12 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
 <!--
 
 Please fill in the following sections.