chore: rename groupId

Author: javier-godoy

pom.xml

@@ -4,7 +4,7 @@
     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>com.flowingcode.vaadin.addons</groupId>
+    <groupId>com.flowingcode.vaadin</groupId>
     <artifactId>json-migration-helper</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <name>Json Migration Helper</name>