Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Bug report
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Provide all outputs described in [Testing](https://github.com/nobodysu/zabbix-smartmontools#testing) step**
+Serial numbers should be replaced with X_SERIAL_X.
+
+**Please complete the following information:**
+ - OS: [e.g. Debian]
+ - Zabbix server version: [e.g. 3.0]
+ - Active or passive check: [e.g. Passive]
+ - Using zabbix proxy: [e.g. No proxy]
+
+**Additional context**
+Add any other context about the problem here.