Fix typo

Author: hankcs

plugins/hanlp_common/hanlp_common/document.py

@@ -137,7 +137,7 @@ def to_conll(self, tok='tok', lem='lem', pos='pos', fea='fea', dep='dep', sdp='s
         Args:
             tok (str): Field name for tok.
             lem (str): Field name for lem.
-            pos (str): Filed name for upos.
+            pos (str): Field name for upos.
             fea (str): Field name for feats.
             dep (str): Field name for dependency parsing.
             sdp (str): Field name for semantic dependency parsing.

plugins/hanlp_common/setup.py

@@ -10,7 +10,7 @@
 
 setup(
     name='hanlp_common',
-    version='0.0.20',
+    version='0.0.21',
     description='HanLP: Han Language Processing',
     long_description=long_description,
     long_description_content_type="text/markdown",