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: predatorray
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Execute command '...'
+2. Enter '....'
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Versions**
+ - OS: [e.g. Linux, Mac]
+ - `kubectl version`: [e.g. v1.16.2]
+ - `tmux -V`: [e.g. 3.1b]
+ - kubectl-tmux-exec: [e.g. 0.1, this could be retrieved by the package manager you use]
+
+**Additional context**
+Add any other context about the problem here.