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: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behaviour.
+
+**Expected behaviour**
+A clear and concise description of what you expected to happen.
+
+**System (please complete the following information):**
+ - OS: [e.g. Ubuntu]
+ - Desktop environment [e.g. Gnome 3.32]
+ - Qt version
+
+**Additional context**
+Add any other context about the problem here.