README.md in embulk-output-db2-0.7.12 vs README.md in embulk-output-db2-0.7.13

@@ -16,9 +16,11 @@
 - **user**: database login user name (string, required)
 - **password**: database login password (string)
 - **database**: destination database name (string, required)
 - **schema**: destination schema name (string, default: use the default schema)
 - **table**: destination table name (string, required)
+- **create_table_constraint** table constraint added to `CREATE TABLE` statement, like `CREATE TABLE <table_name> (<column1> <type1>, <column2> <type2>, ..., <create_table_constraint>) <create_table_option>`.
+- **create_table_option** table option added to `CREATE TABLE` statement, like `CREATE TABLE <table_name> (<column1> <type1>, <column2> <type2>, ..., <create_table_constraint>) <create_table_option>`.
 - **options**: extra connection properties (hash, default: {})
 - **retry_limit** max retry count for database operations (integer, default: 12)
 - **retry_wait** initial retry wait time in milliseconds (integer, default: 1000 (1 second))
 - **max_retry_wait** upper limit of retry wait, which will be doubled at every retry (integer, default: 1800000 (30 minutes))
 - **mode**: "insert", "insert_direct", "truncate_insert" or "replace". See below. (string, required)