remove superfluous checkboxes

Author: ianardee

PULL_REQUEST_TEMPLATE.md

@@ -36,9 +36,7 @@
 <!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
 <!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
 
-- [ ] 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 read the **CONTRIBUTING** document.
 - [ ] I have added tests to cover my changes.
-- [ ] All new and existing tests passed.