Refactor checkboxes and instructions in Pull Request template

.github/pull_request_template.md

@@ -26,17 +26,25 @@
 -->
 
 ## Types of changes
-<!--- What types of changes does your code introduce? Please, put an "x" in all the boxes that apply. -->
-- [ ] Bug fix (non-breaking change which fixes an issue)
-- [ ] Enhancement (non-breaking change which enhances existing functionality)
-- [ ] New feature (non-breaking change which adds functionality)
-- [ ] Breaking change (fix, enhancement or feature that would cause existing functionality to change in backward-incompatible way)
-- [ ] Docs change
-- [ ] Refactoring
-- [ ] Dependency upgrade
+<!--- What types of changes does your code introduce? Please, remove all points that do not apply. -->
+- Bug fix (non-breaking change which fixes an issue)
+- Enhancement (non-breaking change which enhances existing functionality)
+- New feature (non-breaking change which adds functionality)
+- Breaking change (fix, enhancement or feature that would cause existing functionality to change in backward-incompatible way)
+- Docs change
+- Refactoring
+- Dependency upgrade
 
 ## Checklist
-<!--- Please, go over all the following points, and put an "x" in all the boxes that apply. -->
+<!---
+  Please, go over all the following points, and put an "x" in all the boxes that apply.
+
+  If a point is out of scope (e.g. a change in gradle build scripts is not required to be covered with tests),
+  please remove that box, strike trough the sentence describing the point and add a short description
+  as to why that point is out of scope.
+  e.g.
+  - ~~I have added tests to cover my changes~~ (not needed as there are only changes to build files)
+-->
 - [ ] I have read the project's **CONTRIBUTING** document
 - [ ] I have checked my code with the project's static analysis tooling
 - [ ] I have formatted my code with the project's IDEA code-style configuration