Update README.md

Signed-off-by: Joseph Garrone <joseph.garrone.gj@gmail.com>

Author: garronej

test/integration/next/README.md

@@ -5,6 +5,5 @@ You can run it locally with:
 git clone https://github.com/codegouvfr/react-dsfr
 cd react-dsfr
 yarn
-yarn build
 yarn start-next
 ```