Update duckdb index files

.gitattributes

@@ -104,3 +104,4 @@ iwslt2017-nl-ro/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ro-it/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-nl-en/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ja-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-ro-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-ro-en/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:beef4fb38a9b408b41857fa0338bd1aa5d74cf3a4cfb88a66849ba5010a44704
+size 1060864