Update bug report template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report to help us improve
+title: ""
+labels: ["bug"]
+assignees: ''
+---
+
+#### Describe the bug
+<!-- A clear and concise description of what the bug is. -->
+
+#### To Reproduce
+<!-- Steps that can be taken to reproduce the behaviour -->
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+#### Expected behavior
+<!-- A clear and concise description of what you expected to happen. -->
+
+#### Screenshots
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+#### Logs
+<!-- If applicable, add logs to help explain your problem. -->
+
+#### Environment
+
+- tls-certificates-interface library version: <!-- e.g. 1.2 -->
+- Juju version (output from `juju --version`):
+- Cloud Environment: <!-- e.g. GKE -->
+- Kubernetes version (output from `kubectl version --short`):
+
+#### Additional context
+
+<!-- Add any other context about the problem here. -->