fix(0.3/2014-05-28--release_month_and_day.xml): use EXTRACT(YEAR FROM field) instead of YEAR() on PostgreSQL.

The failure was:
liquibase.exception.DatabaseException: ERROR: function year(date) does not exist
Hint: No function matches the given name and argument types. You might need to add explicit type casts.
Position: 35 [Failed SQL: UPDATE series SET release_year=YEAR(released_at) WHERE released_at IS NOT NULL]

Addressed to #1034

Author: php-coder

src/main/resources/liquibase/version/0.3/2014-05-28--release_month_and_day.xml

@@ -35,12 +35,18 @@
 	<changeSet id="fill-release_year-column-based-on-values-from-released_at" author="php-coder" context="test-data, prod-data">
 		<comment>Migrates data from series.released_at to series.release_year</comment>
 
-		<sql>
+		<sql dbms="mysql,h2">
 			UPDATE series
 			SET release_year=YEAR(released_at)
 			WHERE released_at IS NOT NULL
 		</sql>
 
+		<sql dbms="postgresql">
+			UPDATE series
+			SET release_year=EXTRACT(YEAR FROM released_at)
+			WHERE released_at IS NOT NULL
+		</sql>
+		
 	</changeSet>
 
 	<changeSet id="drop-released_at-column-from-series-table" author="php-coder" context="scheme">