Update issue templates: Bug report, FR, Question

Author: dbarnett

.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 the bug**
+[A clear and concise description of what the bug is.]
+
+**To Reproduce**
+Minimal vimrc:
+[If relevant, please provide a minimal vimrc needed to reproduce the issue. You can create a Gist and post it here (example: https://gist.github.com/dbarnett/c129895ce8b783f7559ed7156516c739).]
+
+Steps to reproduce the behavior:
+[
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+]
+
+**Expected behavior**
+[A clear and concise description of what you expected to happen.]
+
+**OS (version)**
+[What is your OS & version, if the problem might depend on platform?]
+
+**Additional context**
+[Add any other context about the problem here.]

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a general question
+title: ''
+labels: question
+assignees: ''
+
+---
+
+