Update issue templates

Author: fcollonval

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: type:Bug
+assignees: ''
+
+---
+
+<!--
+Welcome! Before creating a new issue:
+* This is the GIT EXTENSION for JupyterLab repository. Unrelated issues will be closed.
+* Look at the README *Troubleshooting* section
+* Search for relevant issues
+* Check that you have updated both the jupyterlab extension and the python package to the same version
+* Check that you have installed Git version 2 or higher
+-->
+
+## Description
+
+<!--Describe the bug clearly and concisely. Include screenshots if possible-->
+
+## Reproduce
+
+<!--Describe step-by-step instructions to reproduce the behavior-->
+
+1. Go to '...'
+2. Click on '...'
+3. Scroll down to '...'
+4. See error '...'
+
+## Expected behavior
+
+<!--Describe what you expected to happen-->
+
+## Context
+
+<!--Complete the following for context, and add any other relevant context-->
+
+- Python package version:
+<!-- Results of `conda list jupyterlab-git` or `pip show jupyterlab-git` -->
+- Extension version:
+<!-- Results of `jupyter labextension list` -->
+- Git version:
+<!-- Results of `git --version` -->
+- Operating System and its version:
+
+<details><summary>Command Line Output</summary>
+<pre>
+Paste the output from your command line running `jupyter lab` here, use `--debug` if possible.
+</pre>
+</details>
+
+<details><summary>Browser Output</summary>
+<pre>
+Paste the output from your browser Javascript console here.
+</pre>
+</details>

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: type:Enhancement
+assignees: ''
+
+---
+
+## Is your feature request related to a problem? Please describe.
+<!--A clear and concise description of what the problem is. Ex. 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
+
+<!--Complete the following for context, and add any other relevant context-->
+
+- Python package version:
+<!-- Results of `conda list jupyterlab-git` or `pip show jupyterlab-git` -->
+- Extension version:
+<!-- Results of `jupyter labextension list` -->
+- Git version:
+<!-- Results of `git --version` -->
+- Operating System and its version: