Update pull_request_template.md

.github/pull_request_template.md

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-- [ ] I hereby grant Esoteric Software LLC the non-exclusive, irrevocable right to publish my contribution under the terms of the [Spine Runtimes License Agreement](https://en.esotericsoftware.com/spine-runtimes-license).
+- [ ] I hereby grant Esoteric Software LLC the non-exclusive, irrevocable right to publish my contribution under the terms of the [Spine Runtimes License Agreement](https://esotericsoftware.com/spine-runtimes-license).