Fix review comment

Author: hiroyuki-sato

embulk-input-postgresql/README.md

@@ -19,7 +19,7 @@ PostgreSQL input plugin for Embulk loads records from PostgreSQL.
 - **fetch_rows**: number of rows to fetch one time (used for java.sql.Statement#setFetchSize) (integer, default: 10000)
 - **connect_timeout**: timeout for establishment of a database connection. (integer (seconds), default: 300)
 - **socket_timeout**: timeout for socket read operations. 0 means no timeout. (integer (seconds), default: 1800)
-- **statement_timeout_millis**: statement timeout. `null` means no timeout. (integer (milli seconds), default: null)
+- **statement_timeout_millis**: statement timeout. `null` means no timeout. (integer (milliseconds), default: null)
 - **ssl**: enables SSL. Data will be encrypted but CA or certification will not be verified (boolean, default: false)
 - **application_name**: application name shown on pg_stat_activity. (string, default: "embulk-input-postgresql")
 - **options**: extra JDBC properties (hash, default: {})