use B-tags everywhere for now

app.py

@@ -38,7 +38,7 @@ spaces = [not tok.startswith('##') for tok in tokens][1:] + [False]
 doc = Doc(Vocab(strings=set(tokens)),
           words=tokens,
           spaces=spaces,
-          ents=[tag if tag == "O" else f"I-{tag}" for tag in tags])
+          ents=[tag if tag == "O" else f"B-{tag}" for tag in tags])
 
 labels = TOKEN_TAGS[2:]