Pom fixes

Just few notes:
* It’s unnecessary to define Maven Central repository, this is implicit. The second repo was unnecessary as well, ’cause all dependencies are in Maven Central.
* `url` should be URL of the project’s website, not Apache Maven, this is useless. ;)
* `groupId` should be always identifier of the project, `artifactId` is then identifier of the project’s module etc.
* You’ve created tag 1.0.0, but forgot to bump the version in POM.
* It’s nice to add some metadata like SCM URL, info about developers etc. If you wanna publish the project on Maven Central in future, these information are required.
* `POM.xml` is a XML file so it should start with XML header.