build: update Liquibase to 4.7.1

Also apply a workaround for liquibase/liquibase#2200 by making a path
relative rather than absolute as it was before.

Changelogs:
- https://github.com/liquibase/liquibase/releases/tag/v4.6.0
- https://github.com/liquibase/liquibase/releases/tag/v4.6.1
- https://github.com/liquibase/liquibase/releases/tag/v4.7.0
- https://github.com/liquibase/liquibase/releases/tag/v4.7.1

Fix #1549

Author: php-coder

pom.xml

@@ -627,7 +627,7 @@
 		<license.plugin.version>3.0</license.plugin.version>
 
 		<!-- Redefine default value from spring-boot-dependencies -->
-		<liquibase.version>4.5.0</liquibase.version>
+		<liquibase.version>4.7.1</liquibase.version>
 
 		<!-- Redefine default value from spring-boot-dependencies -->
 		<lombok.version>1.18.22</lombok.version>

src/main/resources/liquibase/version/0.4/2017-05-29--test_image.xml

@@ -9,7 +9,7 @@
 
 		<insert tableName="images_data">
 			<column name="image_id" valueNumeric="1" />
-			<column name="content" valueBlobFile="/test/test.png" />
+			<column name="content" valueBlobFile="../../../test/test.png" />
 		</insert>
 
 	</changeSet>