Update files from the datasets library (from 1.5.0)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.5.0

xtreme.py

@@ -933,7 +933,7 @@ class Xtreme(datasets.GeneratorBasedBuilder):
                 ner_tags = []
                 langs = []
                 for line in f:
-                    if line.startswith("-DOCSTART-") or line == "" or line == "\n":
+                    if line == "" or line == "\n":
                         if tokens:
                             yield guid_index, {"tokens": tokens, "ner_tags": ner_tags, "langs": langs}
                             guid_index += 1