Update README.md

Author: juliohm

README.md

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 # GeoStatsSolvers.jl
 
-[![][build-img]][build-url] [![][codecov-img]][codecov-url]
+**THIS PACKAGE IS DEPRECATED**
 
-Built-in solvers for the [GeoStats.jl](https://github.com/JuliaEarth/GeoStats.jl) framework.
+**All the functionality has been migrated to GeoStats.jl**
 
 ## Asking for help
 
 If you have any questions, please [contact our community](https://juliaearth.github.io/GeoStats.jl/stable/about/community.html).
-
-[build-img]: https://img.shields.io/github/actions/workflow/status/JuliaEarth/GeoStatsSolvers.jl/CI.yml?branch=main&style=flat-square
-[build-url]: https://github.com/JuliaEarth/GeoStatsSolvers.jl/actions
-
-[codecov-img]: https://img.shields.io/codecov/c/github/JuliaEarth/GeoStatsSolvers.jl?style=flat-square
-[codecov-url]: https://codecov.io/gh/JuliaEarth/GeoStatsSolvers.jl