Update issue_response.yml

Author: koide3

.github/workflows/issue_response.yml

@@ -15,6 +15,5 @@ jobs:
           NUMBER: ${{ github.event.issue.number }}
           BODY: >
             Sorry!! We are reducing the support for fast_gicp.
-            Please consider using small_gicp, a new faster library with better portability.
-            https://github.com/koide3/small_gicp
+            Please consider using [small_gicp](https://github.com/koide3/small_gicp), a new faster library with better portability.
             Meanwhile, feel free to open a PR if you have any improvements that can be merged into fast_gicp.