remove logging. basicConfig from library code

pytorch_pretrained_bert/tokenization.py

@@ -25,9 +25,6 @@ import logging
 
 from .file_utils import cached_path
 
-logging.basicConfig(format = '%(asctime)s - %(levelname)s - %(name)s -   %(message)s', 
-                    datefmt = '%m/%d/%Y %H:%M:%S',
-                    level = logging.INFO)
 logger = logging.getLogger(__name__)
 
 PRETRAINED_VOCAB_ARCHIVE_MAP = {