Update PULL_REQUEST_TEMPLATE.md

Author: lowlydba

.github/PULL_REQUEST_TEMPLATE.md

@@ -23,6 +23,6 @@
 <!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
 - [ ] I have updated the Version number of any scripts modified.
 - [ ] I have updated the documentation accordingly.
-- [ ] I have read the [**CONTRIBUTING**](../CONTRIBUTING.md) document.
+- [ ] I have read the [**CONTRIBUTING**](../.github/CONTRIBUTING.md) document.
 - [ ] I have added tests to cover my changes.
 - [ ] All new and existing tests passed.