expiration_time changed to int/double

Author: Vishvajit Pathak

bigquery/client.py

@@ -541,7 +541,7 @@ def create_table(self, dataset, table, schema,
  The name of the table to create
  schema : dict
  The table schema
- expiration_time : float, optional
+ expiration_time : int or double, optional
  The expiry time in milliseconds since the epoch.
  time_partitioning : bool, optional
  Create a time partitioning.