Update README.md

Author: devmotion

README.md

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 # StochasticOptimalTransport
 
-Julia implementation of stochastic optimization algorithms for optimal transport.
+Julia implementation of stochastic optimization algorithms for large-scale optimal transport.
 
 [![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://devmotion.github.io/StochasticOptimalTransport.jl/stable)
 [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://devmotion.github.io/StochasticOptimalTransport.jl/dev)