Adding warning to potential contributors that we're not set up to take PRs through github.
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
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+Dear potential contributor,
+
+Our project is not set up to take Pull Requests through GitHub. Instead we ask that contributions be made through Apache's ReviewBoard. Further instructions can be found here: https://aurora.apache.org/documentation/latest/contributing/
+
+Thank you for your understanding.
+
+- The Apache Aurora Team
