Preferably, we want to fix this typo

Author: rayluo

oauth2cli/oauth2.py

@@ -199,7 +199,7 @@ def _obtain_token(  # The verb "obtain" is influenced by OAUTH2 RFC 6749
             _data["client_assertion"] = encoder(
                 self.client_assertion()  # Do lazy on-the-fly computation
                 if callable(self.client_assertion) else self.client_assertion
-                )   # The type is bytes, which is preferrable. See also:
+                )   # The type is bytes, which is preferable. See also:
                     # https://github.com/psf/requests/issues/4503#issuecomment-455001070
 
         _data.update(self.default_body)  # It may contain authen parameters