Add CREATED_AT and CREATED_BY columns.

Author: cssru

src/main/resources/liquibase/version/0.4/2016-09-28--add_creator_data_to_series_sales.xml

@@ -6,11 +6,12 @@
 		http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.0.xsd">
 
 	<changeSet id="add-creator-columns-to-series_sales_table" author="cssru" context="scheme">
+		<comment>We use this way because of MySQL version supported by TravisCI (<5.6.6)</comment>
 
 		<addColumn tableName="series_sales">
 			<column name="created_at" type="DATETIME" />
 			<column name="created_by" type="INTEGER"
-					defaultValueComputed="SELECT u.id FROM users u WHERE u.role = 'ADMIN' LIMIT 1">
+					defaultValueComputed="(SELECT u.id FROM users u WHERE u.role = 'ADMIN' LIMIT 1)">
 				<constraints nullable="false"
 					references="users(id)"
 					foreignKeyName="fk_series_sales_users_id" />