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.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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-## 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)
-- [ ] I have read the **CONTRIBUTING** document.
-- [ ] My code follows the code style of this project.
-- [ ] My change requires a change to the documentation.
-- [ ] I have updated the documentation accordingly.
-- [ ] I have added tests to cover my changes.
-- [ ] All new and existing tests passed.