Update README.md

Author: kunyuan

README.md

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 # ElectronGas
 
-[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://numericalEFT.github.io/ElectronGas.jl/stable)]
-[![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://numericalEFT.github.io/ElectronGas.jl/dev)]
+[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://numericalEFT.github.io/ElectronGas.jl/stable)
+[![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://numericalEFT.github.io/ElectronGas.jl/dev)
 [![Build Status](https://github.com/numericalEFT/ElectronGas.jl/actions/workflows/CI.yml/badge.svg?branch=master)](https://github.com/numericalEFT/ElectronGas.jl/actions/workflows/CI.yml?query=branch%3Amaster)
 [![codecov](https://codecov.io/gh/numericalEFT/ElectronGas.jl/branch/master/graph/badge.svg?token=9F4KD8O8W2)](https://codecov.io/gh/numericalEFT/ElectronGas.jl)