Update README.md

Author: krynju

README.md

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 Distributed table structures and data manipulation operations built on top of [Dagger.jl](https://github.com/JuliaParallel/Dagger.jl)
 
-[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://juliaparallel.github.io/DTables.jl/stable/)
 [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://juliaparallel.github.io/DTables.jl/dev/)
 [![Build Status](https://github.com/juliaparallel/DTables.jl/actions/workflows/CI.yml/badge.svg?branch=main)](https://github.com/juliaparallel/DTables.jl/actions/workflows/CI.yml?query=branch%3Amain)
 [![Coverage](https://codecov.io/gh/juliaparallel/DTables.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/juliaparallel/DTables.jl)