improve issue template.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+<!--
+Have you read Mocha's Code of Conduct? By filing an Issue, you are expected to comply with it, including treating everyone with respect: https://github.com/mochajs/mocha/blob/master/.github/CODE_OF_CONDUCT.md
+For more, check out the Mocha Gitter chat room: https://gitter.im/mochajs/mocha
+-->
+
+### Prerequisites
+
+<!--
+Place an `x` between the square brackets on the lines below for every satisfied prerequisite.
+-->
+
+- [ ] Checked that your issue hasn't already been filed by cross-referencing [issues with the `faq` label](https://github.com/mochajs/mocha/issues?utf8=%E2%9C%93&q=is%3Aissue%20label%3Afaq%20)
+- [ ] Checked next-gen ES issues and syntax problems by using the same environment and/or transpiler configuration without Mocha to ensure it isn't just a feature that actually isn't supported in the environment in question or a bug in your code.
+- [ ] 'Smoke tested' the code to be tested by running it outside the real test suite to get a better sense of whether the problem is in the code under test, your usage of Mocha, or Mocha itself
+- [ ] Ensured that there is no discrepancy between the locally and globally installed versions of Mocha. You can find them with: `node node_modules/.bin/mocha --version`(Local) and `mocha --version`(Global). We recommend avoiding the use of globally installed Mocha.
+
+### Description
+
+<!--
+[Description of the issue]
+-->
+
+### Steps to Reproduce
+
+<!--
+Please add a series of steps to reproduce the problem. See https://stackoverflow.com/help/mcve for in depth information
+on how to create a minimal, complete, and verifiable example.
+-->
+
+**Expected behavior:** [What you expect to happen]
+
+**Actual behavior:** [What actually happens]
+
+**Reproduces how often:** [What percentage of the time does it reproduce?]
+
+### Versions
+
+<!-- If applicable, please specify: -->
+
+- The output of `mocha --version` and `node node_modules/.bin/mocha --version`:
+- The output of `node --version`:
+- The version and architecture of your operating system:
+- Your shell (bash, zsh, PowerShell, cmd, etc.):
+- Your browser and version (if running browser tests):
+- Any other third party Mocha related modules (with versions):
+- The code transpiler being used:
+
+### Additional Information
+
+<!--
+Any additional information, configuration or data that might be necessary to reproduce the issue.
+-->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for Mocha
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/support-question.md

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+---
+name: Support Question
+about: If you have a question, please check out our Gitter or StackOverflow!
+
+---
+
+--------------^ Click "Preview" for a nicer view!
+We primarily use GitHub as an issue tracker; for usage and support questions, please check out these resources below. Thanks!.
+
+* Chat room: http://gitter.im/mochajs/mocha
+* StackOverflow: https://stackoverflow.com/questions/tagged/mocha using the tag `mocha`