Add a pull request template.

diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
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+++ b/.github/PULL_REQUEST_TEMPLATE.md
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+<!--
+Please fill in the template below. Pull requests that do not use this
+template will be closed without warning.
+-->
+
+## Summary
+
+<!--
+Briefly describe what this pull request changes.
+-->
+
+## Rationale
+
+<!--
+Describe why you have made this change.
+-->
+
+## Testing Environment
+
+<!--
+Describe the environment in which you have tested this change:
+-->
+
+I have tested this pull request on:
+
+**Operating system name and version:** <!-- e.g. Linux 3.11 -->
+**Compiler name and version:** <!-- e.g. GCC 4.2.0 -->
+
+## Checks
+
+<!--
+Tick the boxes for the checks you have made.
+-->
+
+I have ensured that:
+
+  - [ ] This pull request does not introduce any incompatible API changes.
+  - [ ] If ABI changes have been made I have incremented INSPIRCD_VERSION_API.
+  - [ ] I have documented any features added by this pull request.