Update issue templates (nvim-lua#72)

Author: tjdevries

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,26 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Any bug report not following this template will be immediately closed. Thanks -->
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. ...
+
+**Desktop (please complete the following information):**
+- OS: 
+- Terminal: 
+
+** Neovim Version **
+ - Output of running `:version` from inside of neovim:
+
+```
+```