Update README.md

Author: OlivierHnt

README.md

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-# IntervalArithmetic.jl
+<h1 align="center">
+IntervalArithmetic
 
+[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://juliaintervals.github.io/IntervalArithmetic.jl/stable)
+[![DOI](https://zenodo.org/badge/87007945.svg)](https://zenodo.org/badge/latestdoi/87007945)
 [![Build Status](https://github.com/JuliaIntervals/IntervalArithmetic.jl/workflows/CI/badge.svg)](https://github.com/JuliaIntervals/IntervalArithmetic.jl/actions/workflows/CI.yml)
 [![coverage](https://codecov.io/gh/JuliaIntervals/IntervalArithmetic.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaIntervals/IntervalArithmetic.jl)
-
-[![DOI](https://zenodo.org/badge/87007945.svg)](https://zenodo.org/badge/latestdoi/87007945)
-
-[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://juliaintervals.github.io/IntervalArithmetic.jl/stable)
+</h1>
 
 IntervalArithmetic.jl is a Julia package for validated numerics in Julia. All calculations are carried out using [interval arithmetic](https://en.wikipedia.org/wiki/Interval_arithmetic) where quantities are treated as intervals. The final result is a rigorous enclosure of the true value.