fix: configure Liquibase to use NOW() on PostgreSQL to fix migrations.

The failure was:
liquibase.exception.DatabaseException: ERROR: syntax error at or near "$"
Position: 162 [Failed SQL: INSERT INTO public.categories
(id, name, name_ru, created_at, created_by, updated_at, updated_by)
VALUES ('1', 'Prehistoric animals', 'Доисторические животные', ${NOW}, '2', ${NOW}, '2')]

Addressed to #1034

Author: php-coder

src/main/resources/liquibase/changelog.xml

@@ -5,7 +5,7 @@
 	xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
 		http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.0.xsd">
 
-	<property name="NOW" value="NOW()" dbms="mysql" />
+	<property name="NOW" value="NOW()" dbms="mysql,postgresql" />
 	<property name="NOW" value="CURRENT_TIMESTAMP()" dbms="h2" />
 
 	<include file="initial-state.xml" relativeToChangelogFile="true" />