simplifying the PR template

Author: djarecka

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,21 +1,13 @@
-## Acknowledgment
-- [ ] I acknowledge that this contribution will be available under the Apache 2 license.
-
 ## Types of changes
-<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
-- [ ] Bug fix (non-breaking change which fixes an issue)
-- [ ] New feature (non-breaking change which adds functionality)
-- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+<!--- What types of changes does your code introduce? Keep only relevant points: -->
+- Bug fix (non-breaking change which fixes an issue)
+- New feature (non-breaking change which adds functionality)
+- Breaking change (fix or feature that would cause existing functionality to change)
 
 ## Summary
 <!--- What does your code do? -->
 
 ## Checklist
 <!--- Please, let us know if you need help-->
-- [ ] All tests passing
-- [ ] I have added tests to cover my changes
+- [ ] I have added tests to cover my changes (if necessary)
 - [ ] I have updated documentation (if necessary)
-- [ ] My code follows the code style of this project
-(we are using `black`: you can `pip install pre-commit`,
-run `pre-commit install` in the `pydra` directory
-and `black` will be run automatically with each commit)