fix release.yaml

add source and javadoc plugins

FIX: inputFile path resolution

add maven integration tests

IMPROVE: Indentation for columns improved for better readability. (#2)

-> define skinparam tabSize of 4 spaces
-> use \t to indent columns

Feature/start parsing complex liquibase change logs (#1)

* finished parser implementation
** support tillTag
** support all necessary liquibase refactoring tags

* generate simple plantuml entity relationship diagram for parsed tables

showcase what is the goal of this extension