Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Configuration file**
+Paste here your netbox agent configuration file
+
+**Environment:**
+ - OS: [e.g. Ubuntu 18.04]
+ - Netbox agent version [e.g. master, v0.6.0]
+
+**Additional context**
+Add any other context about the problem here.