Update PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,12 +1,13 @@
 ### Description
+
 <!-- Describe your changes in detail -->
 
-
 ### Motivation & Context
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 <!-- Why is this change required? What problem does it solve? -->
 
-
 ### 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)
@@ -15,6 +16,7 @@
 - [ ] Breaking change (fix or feature that would change existing functionality)
 
 ### Checklist
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 <!-- 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! -->
 
@@ -26,6 +28,7 @@
 - [ ] All new and existing tests passed
 
 ### Related issues
+
 <!-- Please link any related issues here. -->
 
 ### [Live preview](https://deploy-preview-{your pr number}--twbs-bootstrap.netlify.app/)