Update issue templates

Bug template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Code to reproduce (C, php, perl, lua or other binding)
+2. Source images if needed
+
+**Expected behavior**
+A clear and concise description of what you expected to happen. If the code outputs images (save or directly), please provide the expected image result if possible.
+
+**Actual results**
+The values returned by GD or the actual image generated by the code.
+
+**Environment (please complete the following information):**
+ - OS: [e.g. Debian]
+ - Version [e.g. 2.3.5]
+- All libraries used by GD and their respective version (eg. Freetype 2.2.5)
+
+**Additional context**
+Add any other context about the problem here.