Update model metadata to set pipeline tag to the new `text-ranking` (#2)

- Update model metadata to set pipeline tag to the new `text-ranking` (28c27d8166ef7abc0f11377828f4d62891262689)


Co-authored-by: Tom Aarsen <[email protected]>

README.md

@@ -1,5 +1,5 @@
 ---
-pipeline_tag: sentence-similarity
+pipeline_tag: text-ranking
 tags:
 - sentence-transformers
 - feature-extraction