Update PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,4 +1,11 @@
-👋🏽 Thanks for opening a pull request!
+### Context
 
-* Please explain clearly your changes. If they involve a lot of code, let discuss them first in on our chat: https://spectrum.chat/react-day-picker?tab=chat
-* 🙏🏽 Please **DO NOT** build files or update the docs in your pull request – as this may cause git conflicts. Thanks!
+Explain the context of this Pull Request: why are you proposing this change? What is the issue? Include links to issues or discussions.
+
+### Analysis
+
+Describe in details why the current code is not working as expected, or why you need to improve it.
+
+### Solution
+
+Explain the reasoning behind the changes implemented in this PR.