added separated issue templates for bug and feature request

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve petl
+title: ''
+labels: 'Bug'
+assignees: ''
+
+---
+
+## Problem description
+
+### What's happenning
+
+A clear and concise description of what the bug is. Please explain:
+
+- what the current output/behavior is
+- what's the bug is preventing you from doing
+- tell if it had worked before but regressed and stopped working
+
+### Expected behavior
+
+A clear and concise description of intended behavior. Please explain:
+
+- what you expected to happen.
+- how the current output/behavior doesn't match the intended behavior.
+
+## Scenario for reprodution
+
+### Reproducible test case
+
+Please provide a minimal, reproducible code sample, a copy-pastable example if possible:
+
+```python
+# Your code here
+
+```
+
+### Version and installation information
+
+Please provide the following:
+
+- Value of ``petl.__version__``
+- Version information for any third-party package dependencies that are relevant
+- Version of Python interpreter
+- Operating system (Linux/Windows/Mac)
+- How petl was installed (e.g., "using pip into virtual environment", or "using conda")
+
+Also, if you think it might be relevant, please provide the output from ``pip freeze`` or
+``conda env export`` depending on which was used to install petl.
+
+### Additional context
+
+Add any other context about the problem here.
+
+Also, feel free to remove all sections and text that aren't relevant.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: 'Feature'
+assignees: ''
+
+---
+
+## Problem description
+
+### Is your feature request related to a problem?
+
+A clear and concise description of what the problem is.
+Ex. I'm always frustrated when [...]
+
+## Change description
+
+### Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+Whenever relevant, please provide a code sample, of what would be the syntax, the way you
+meant to use:
+
+```python
+# Your code here
+
+```
+
+### Advantages
+
+Explain why the current behavior is a problem, what the expected output/behavior
+is, and why the expected output/behavior is a better solution.
+
+### 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 information about the feature request here.
+Please feel free to use whatever template makes sense.
+
+Also, feel free to remove all sections and text that aren't relevant.