Update README.md

Author: ocots

README.md

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 Geometric preconditioner for indirect shooting
 
 This repo is part of the [control-toolbox ecosystem](https://github.com/control-toolbox). 
-The control-toolbox ecosystem gathers `Julia` packages for mathematical control and applications. The root package is [`OptimalControl.jl`](https://github.com/control-toolbox/OptimalControl.jl) which aims to provide tools to modelise and solve optimal control problems by direct and indirect methods. [![doc OptimalControl.jl](https://img.shields.io/badge/doc-OptimalControl.jl-blue)](http://control-toolbox.org/OptimalControl.jl)
+The control-toolbox ecosystem gathers Julia packages for mathematical control and applications. The root package is [OptimalControl.jl](https://github.com/control-toolbox/OptimalControl.jl) which aims to provide tools to modelise and solve optimal control problems by direct and indirect methods. [![doc OptimalControl.jl](https://img.shields.io/badge/doc-OptimalControl.jl-blue)](http://control-toolbox.org/OptimalControl.jl)
 
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-| [![Documentation][doc-stable-img]][doc-stable-url] [![Documentation][doc-dev-img]][doc-dev-url] | [![Build Status][ci-img]][ci-url] [![Covering Status][co-img]][co-url] |
+| [![Documentation][doc-stable-img]][doc-stable-url] [![Documentation][doc-dev-img]][doc-dev-url] | [![Build Status][ci-img]][ci-url] [![Covering Status][co-img]][co-url] |