Simplify4U parent POM

'com.github.s4u:parent:2.0.0'

<dependency>
	<groupId>com.github.s4u</groupId>
	<artifactId>parent</artifactId>
	<version>2.0.0</version>
</dependency>

<dependency org="com.github.s4u" name="parent" rev="2.0.0"/>

"com.github.s4u", "parent", "2.0.0"