modify README/pom.xml to align with the dependency story

- Remove joda-time dependency from initial/pom.xml to aligh with the story: "If you were to run mvn compile to build the project now, the build would fail because you’ve not declared Joda Time as a compile dependency in the build."
- (a tiny fix) the result JAR file should be "{project_id}-0.1.0.jar" rather than "{project_id}-initial-0.1.0.jar"