♻️ (pom.xml): refactor XML formatting for better readability and main…

…tainability

⬆️ (pom.xml): downgrade version from 0.6.0-SNAPSHOT to 0.5.6-SNAPSHOT for compatibility
🔧 (pom.xml): update artifactId from test-harness to liquibase-test-harness for clarity

pom.xml

@@ -1,10 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.liquibase</groupId>
     <artifactId>liquibase-parent-pom</artifactId>
     <name>Liquibase Parent POM</name>
-    <version>0.6.0-SNAPSHOT</version>
+    <version>0.5.6-SNAPSHOT</version>
     <description>Liquibase Parent POM for all Extensions</description>
     <url>https://github.com/liquibase/liquibase-parent-pom</url>
     <packaging>pom</packaging>
@@ -798,7 +800,7 @@
             <dependencies>
                 <dependency>
                     <groupId>org.liquibase</groupId>
-                    <artifactId>test-harness</artifactId>
+                    <artifactId>liquibase-test-harness</artifactId>
                     <version>master-SNAPSHOT</version>
                 </dependency>
             </dependencies>