Add `opus-mt-tc` tag

Add `opus-mt-tc` tag so that this new marian models can be found more easily

README.md

@@ -2,10 +2,9 @@
 language:
 - fi
 - uk
-
 tags:
 - translation
-
+- opus-mt-tc
 license: cc-by-4.0
 model-index:
 - name: opus-mt-tc-base-uk-fi
@@ -19,9 +18,9 @@ model-index:
       type: flores_101
       args: ukr fin devtest
     metrics:
-       - name: BLEU
-         type: bleu
-         value: 19.6
+    - name: BLEU
+      type: bleu
+      value: 19.6
 ---
 # opus-mt-tc-base-uk-fi