Update issue templates

Author: CodeF0x

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: A bug you want to report.
+title: "[Bug]"
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+What needs to be done to reproduce the bug?
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If it's an UI problem, please include a screenshot.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. Windows 10, Debian 9, etc.]
+ - Version [e.g. Violin 2.2.1, Violin 2.1.1, etc.]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/enhancement---feature-request.md

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+---
+name: Enhancement / feature request
+about: Suggest an idea for this project.
+title: "[Feature / enhancement]"
+labels: enhancement / feature request
+assignees: ''
+
+---
+
+**Is it something new or an improvement to something already existing?**
+Either "New" or "Improvement".
+
+**What's your idea?**
+Tell us what you would like to have as a part of Violin. Please be as detailed as possible.
+
+**Why do you want that? (Optional)**
+Why do you think that's an improvement?
+
+**Additional context**
+Add any other context or screenshots about the feature request here.