update readme

README.md

@@ -3,7 +3,12 @@ Maru.Entity
 
 > Parallelizable serializer inspired by [grape-entity](https://github.com/ruby-grape/grape-entity).
 
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+[![Hex Docs](https://img.shields.io/badge/hex-docs-lightgreen.svg)](https://hexdocs.pm/maru_entity/)
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+[![License](https://img.shields.io/hexpm/l/maru_entity.svg)](https://github.com/elixir-maru/maru_entity/blob/master/LICENSE)
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 ### Usage