Update pull_request_template.md

pull_request_template.md

@@ -3,6 +3,7 @@
 > * Please do note that this is a GPL v3.0 open source project.
 > * Please read the [CONTRIBUTING](https://github.com/spice2x/spice2x.github.io/blob/main/CONTRIBUTING.md) guide.
 > * Maintainers reserve the right to reject or modify your submission without reason.
+> * No new compiler warnings must be introduced. Check the CI build results.
 > 
 > Feel free to remove this section after you have read it.
 
@@ -12,8 +13,5 @@
 ## Description of change
 *what does this code do?*
 
-## Compiling
-*you must be able to compile with the included Docker script with zero compiler warnings*
-
 ## Testing
 *how was the code tested?*