Update issue templates

Author: valenting

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,13 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+- [ ] Note that this crate implements the [URL Standard](https://url.spec.whatwg.org/) not RFC 1738 or RFC 3986
+
+**Describe the bug**
+A clear and concise description of what the bug is. Include code snippets if possible.