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: Athemis
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Do '...'
+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.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. Windows 10, GNU/Linux (Ubuntu 18.04), etc.]
+ - Minecraft Version [e.g. 1.15.2]
+ - Modded: yes/no
+ - Mods installed: (if applicable)
+
+**Additional context**
+Add any other context about the problem here.