Update README

Author: kaiso

Diff for: README.md

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 The RelMongo Java framework provides relationships mapping of MongoDB domain model objects. The framework provides annotations like OneToMany, OneToOne and ManyToOne as an alternative for DBRef and allows cascade operations and lazy loading. RelMongo uses Spring data mongodb and manual references which make lookup aggregations work properly and overcomes DBRef limitations. [Learn more...](https://kaiso.github.io/relmongo/)