Reduce the text in PR template to hopefully get more users to read

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,8 +1,6 @@
 <!---
 
-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.
+Please describe the reason for the changes you're proposing. If it is a large change, please open an issue to discuss first.
 
 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.