revert: "build(pom.xml): update H2 to 1.4.199"

H2 starting from 1.4.198 is broken and fails with error:

liquibase.exception.MigrationFailedException: Migration failed for change set classpath:/liquibase/version/0.4/2017-11-14--separate_buyers_and_sellers.xml::make-is_buyer-non-nullable::php-coder:
     Reason:
          classpath:/liquibase/changelog.xml : SQL Precondition failed.  Expected '0' got '3'

This reverts commit f087be3.

Author: php-coder

pom.xml

@@ -505,7 +505,7 @@
 		<groovy.version>2.0.8</groovy.version>
 
 		<!-- Redefine default value from spring-boot-dependencies (https://github.com/spring-projects/spring-boot/blob/v1.5.20.RELEASE/spring-boot-dependencies/pom.xml) -->
-		<h2.version>1.4.199</h2.version>
+		<h2.version>1.4.197</h2.version>
 
 		<!-- Redefine default value from spring-boot-dependencies (https://github.com/spring-projects/spring-boot/blob/v1.5.20.RELEASE/spring-boot-dependencies/pom.xml) -->
 		<hamcrest.version>1.3</hamcrest.version>