Add a pull request template for update

Author: gregswift

.github/PULL_REQUEST_TEMPLATE/update-makefile.md

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+# Description
+
+Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.
+
+Fixes # (issue)
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- [ ] 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)
+- [ ] This change requires a documentation update
+
+# How Has This Been Tested?
+
+Please describe the tests that you ran to verify your new Makefile. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration
+
+- [ ] Test A
+- [ ] Test B
+
+# What platforms does this support?
+
+- [ ] Linux
+- [ ] Darwin/macos
+- [ ] Window