Follow cakephp/app template

.github/PULL_REQUEST_TEMPLATE.md

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+<!---
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 Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue.
 
 The best way to propose a feature is to open an issue first and discuss your ideas there before implementing them.
 
 Always follow the [contribution guidelines](https://github.com/cakephp/cakephp/blob/master/.github/CONTRIBUTING.md) when submitting a pull request. In particular, make sure existing tests still pass, and add tests for all new behavior. When fixing a bug, you may want to add a test to verify the fix.
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+-->