Update issue templates (ParallelSSH#246)

* Updated issue templates

Author: pkittenis

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+---
+
+_For general questions please use the [mail group](https://groups.google.com/forum/#!forum/parallel-ssh)._
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+
+Steps to reproduce the behavior:
+1. Example code that produces error.
+2. Stack trace or error messages.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Actual behaviour**
+What actually happened.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional information**
+Include version of ``ssh2-python`` and any other relevant information.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Eg. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.