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: bug
+assignees: ''
+
+---
+
+### Describe what happened and what your expected to happen
+### How to reproduce it (as minimally and precisely as possible)
+### Tell us your environment
+
+- nvim version:
+- octo.nvim commit hash: 
+- OS:
+
+### Anything else we need to know?

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+### What feature you want
+
+Do you have a work around?
+
+Does this build upon an existing feature?