Update README.markdown for Achilles 3.0.2 release

Update README.markdown for Achilles 3.0.2 release
Fixes #55 Cannot find PersistenceManagerFactory for keyspace 'achilles_test' in test
Fixes #56 Test failed: EntityMetaTest.should_to_string
Support list of entities classes
Merge pull request #58 from serssp/listEntities

Support list of entities classes
Refactor slightly pull request
Fixes #57 Support inheritance for @EmbeddedId classes
Fixes #59 @Index on Enum field throws AchillesBeanMappingException
Fixes #40 Add helper method to serialize Entity into Json
Fixes #43 Implement CAS using Options
Rename TypedQueryBuilder and NativeQueryBuilder
Fixes #53 Add support for @EmptyCollectionIfNull
Add 'achilles.osgi.class.loader' parameter for CGLIB proxy creation
Add OSGi meta data
Rebase from master
WIP