Update README.md

Author: ameligrana

README.md

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 # LightSumTypes.jl
 
-!! The package is in the process to being renamed from DynamicSumTypes to LightSumTypes !!
-
 [![CI](https://github.com/JuliaDynamics/LightSumTypes.jl/workflows/CI/badge.svg)](https://github.com/JuliaDynamics/LightSumTypes.jl/actions?query=workflow%3ACI)
 [![](https://img.shields.io/badge/docs-stable-blue.svg)](https://juliadynamics.github.io/LightSumTypes.jl/stable/)
 [![codecov](https://codecov.io/gh/JuliaDynamics/LightSumTypes.jl/graph/badge.svg?token=rz9b1WTqCa)](https://codecov.io/gh/JuliaDynamics/LightSumTypes.jl)