Better issue template

<img width="1418" alt="image" src="https://user-images.githubusercontent.com/1909539/88467715-c12f4580-ce8e-11ea-899c-c14a3dc914a8.png">
<img width="1373" alt="image" src="https://user-images.githubusercontent.com/1909539/88467718-c8565380-ce8e-11ea-9498-47b509b28445.png">

Now readable in one page

Author: chenglou

.github/CHECK_LIST.md

@@ -1,10 +1,7 @@
-Issues are for bugs. If you have questions, ask them on a [community forum][forum] or [chat][chat]. Folks are friendly and happy to help!
-
-[forum]: https://reasonml.chat
-[chat]: https://discord.gg/reasonml
-
-For bug reports, in general, it is recommended to report potential bugs in **OCaml syntax**, this will help reduce the possible bug causes from Reason side.
-
-Please have a look at checklist before submitting issues:
-
-https://github.com/BuckleScript/bucklescript/blob/master/.github/CHECK_LIST.md
+Thank you for filing! Check list:
+- [ ] Is it a bug? Usage questions should often be asked in the [forum](https://reasonml.chat) instead.
+- [ ] Concise, focused, friendly issue title & description.
+- [ ] A [minimal, reproducible example](http://sscce.org).
+  - [ ] Ideally in OCaml syntax for now. To isolate the problem caused by either Reason or the New Syntax.
+- [ ] OS and browser versions, if relevant.
+- [ ] Is it already fixed in master?