Improve the issue template.

The current issue template uses HTML comment tags to remove template text from the rendered output. I have gone through the last dozen issues filed, and it appears everyone deletes that anyways. By removing the comment tags, people can click "Preview" and get a pretty print of the template markdown.

Reformat lists and links. Tries to get links as close to the left edge as possible, so they are easy to see, and copy-paste from the raw markdown editor. Puts multiple links on their own line for the same reason.

Adds a request that they explicitly tell us what their AVA and `npm` versions are.

Adds a section for their AVA config and CLI args.

Adds a section for linking to thier project if public.

Requests they create a minimal reproduction and post it to GitHub.

Closes #787

.github/issue_template.md

@@ -1,33 +1,68 @@
-<!--
+<!-- CLICK "Preview" FOR INSTRUCTIONS IN A MORE READABLE FORMAT -->
 
 ## Prerequisites
 
+- We realize there is a lot of data requested here. We ask only that you do your best to provide as much information as possible so we can better help you.
 - Read the [contributing guidelines](https://github.com/sindresorhus/ava/blob/master/contributing.md).
-- Support questions are better asked in our [chat](https://gitter.im/sindresorhus/ava) or on [Stack Overflow](https://stackoverflow.com/questions/tagged/ava).
+- Support questions are better asked in one of the following locations:
+  - [Our chat](https://gitter.im/sindresorhus/ava)
+  - [Stack Overflow](https://stackoverflow.com/questions/tagged/ava)
 - Ensure the issue isn't already reported.
-- Should be reproducible with the latest AVA version. (Ensure `ava --version` matches ![](https://img.shields.io/npm/v/ava.svg))
+- Should be reproducible with the latest AVA version.
+  - (Ensure `ava --version` matches ![](https://img.shields.io/npm/v/ava.svg))
 
--->
+*Delete the above section and the instructions in the sections below before submitting*
 
 ## Description
 
-<!--
+If this is a feature request, explain why it should be added. Specific use cases are best.
 
-Description of the issue.
+For bug reports, please provide as much *relevant* info as possible.
 
-If it's a feature request, include why it should be added.
+### Test Source
 
--->
+```js
+// Avoid posting hundreds of lines of source code.
+// Edit to just the relevant portions.
+```
 
+### Error Message & Stack Trace
 
-## Environment
+```
+COPY THE ERROR MESSAGE, INCLUDING STACK TRACE HERE
+```
 
-<!--
+### Config
 
-Include the Node.js version and operating system. Run the following to get it quickly:
+Copy the relevant section from `package.json`:
 
+```json
+{
+  "ava": {
+  ...
+  }
+}
 ```
-node -e "var os=require('os');console.log('Node.js ' + process.version + '\n' + os.platform() + ' ' + os.release())"
+
+### Command Line Arguments
+
+Copy your npm build scripts or the `ava` command used:
+
+```
+ava [OPTIONS HERE]
 ```
 
--->
+## Relevant Links
+
+- If your project is public, link to the repo so we can investigate directly.
+- **BONUS POINTS:** Create a [minimal reproduction](http://stackoverflow.com/help/mcve) and upload it to GitHub. This will get you the fastest support.
+
+## Environment
+
+Tell us which operating system you are using, as well as which versions of  Node.js, npm, and AVA. Run the following to get it quickly:
+
+```
+node -e "var os=require('os');console.log('Node.js ' + process.version + '\n' + os.platform() + ' ' + os.release())"
+ava --version
+npm --version
+```