Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+If you open a GitHub issue, here is our policy:
+
+1. It must be a bug, a feature request, or a significant problem with documentation (for small docs fixes please send a PR instead).
+2. The form below must be filled out.
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+### System information
+**Desktop (please complete the following information):**
+- **OS Platform and Distribution (e.g., Linux Ubuntu 16.04)**:
+- **Python version (for issues related to the python wrapper)**: 
+- **Java version (for issues related to the java wrapper)**: 
+- **MATLAB version (for issues related to the matlab wrapper)**: 
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**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**
+Add any other context or screenshots about the feature request here.