testssl.sh/.github/pull_request_template.md

## Describe your changes

Please refer to an issue here or describe the change thoroughly in your PR.

## What is your pull request about?
- [ ] 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 not work as expected)
- [ ] Typo fix
- [ ] Documentation update
- [ ] Update of other files


## If it's a code change please check the boxes which are applicable
- [ ] For the main program: My edits contain no tabs and the indentation is five spaces
- [ ] I've read CONTRIBUTING.md and Coding_Convention.md 
- [ ] I have tested this __fix__ against >=2 hosts and I couldn't spot a problem
- [ ] I have tested this __new feature__ against >=2 hosts which show this feature and >=2 host which does not (in order to avoid side effects) . I couldn't spot a problem
- [ ] For the __new feature__ I have made corresponding changes to the documentation and / or to ``help()``
- [ ] If it's a bigger change: I added myself to CREDITS.md (alphabetical order) and the change to CHANGELOG.md