Improve GH issue template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+## Problem/Motivation
+
+> (Why the issue was filed)
+
+## Expected behaviour
+
+> (What you expected to happen)
+
+## Actual behaviour
+
+> (What actually happened)
+
+## Steps to reproduce
+
+> (How can someone else make/see it happen)
+>
+> (Please include any relevant links. Think: links to a branch in a repo where you are experiencing the problem
+> which can be used to reproduce the issue, links to external standards you are using.)
+> (Also, if relevant and if it can be used to reproduce the issue, please paste the contents of your `composer.json`
+> file here.
+>
+> ```json
+> (Content of the `composer.json` file)
+> ```
+
+## Proposed changes
+
+> (If you have a proposed change, workaround or fix, describe the rationale behind it)
+
+## Environment
+
+| Question               | Answer
+| ------------------------| -------
+| OS                                | Windows/Linux/Mac (preferably with some version info)
+| PHP version                       | x.y.z
+| Composer version                  | x.y.z
+| PHP_CodeSniffer version           | x.y.z
+| Dealerdirect PHPCS plugin version | x.y.z
+| Install type                      | e.g. Composer global, Composer project local, other (please expand)
+
+
+## Tested against `master` branch?
+- [ ] I have verified the issue still exists in the `master` branch.